"first call" meaning in English

{
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      "expansion": "first call (uncountable)",
      "name": "en-noun"
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  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
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          "kind": "other",
          "name": "English entries with incorrect language header",
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      "examples": [
        {
          "ref": "2000, Charles Foster, Stardust and Shadows: Canadians in Early Hollywood, page 51",
          "text": "Fairbanks obviously had the power to dictate because his contract, and an amended one with Griffith, gave him first call on me as a dentist while Griffith retained first call on my services as an actor.",
          "type": "quotation"
        },
        {
          "ref": "2004, Stephen Unwin, So You Want to be a Theatre Director?, page 77",
          "text": "In these conditions, however, you must be sensitive to the actor's need to do other work: you've got to let them go up for auditions and earn money in other ways, and only the most megalomaniac director thinks that he has 'first call' on his actors' time.",
          "type": "quotation"
        },
        {
          "ref": "2010, Ian Brown, From Tartan to Tartanry: Scottish Culture, History and Myth, page 169",
          "text": "Consequently, Harper argues, 'costume film-makers in Britain no longer had first call on their own classic novelists. […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Priority on the use of somebody or something, especially an actor if required in a production."
      ],
      "id": "en-first_call-en-noun-T3qOrlSS",
      "links": [
        [
          "Priority",
          "priority"
        ],
        [
          "actor",
          "actor"
        ],
        [
          "production",
          "production"
        ]
      ],
      "related": [
        {
          "word": "first bite of the cherry"
        }
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "first call"
}

{
  "head_templates": [
    {
      "args": {
        "1": "-"
      },
      "expansion": "first call (uncountable)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "related": [
    {
      "word": "first bite of the cherry"
    }
  ],
  "senses": [
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        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with quotations",
        "English uncountable nouns",
        "Quotation templates to be cleaned"
      ],
      "examples": [
        {
          "ref": "2000, Charles Foster, Stardust and Shadows: Canadians in Early Hollywood, page 51",
          "text": "Fairbanks obviously had the power to dictate because his contract, and an amended one with Griffith, gave him first call on me as a dentist while Griffith retained first call on my services as an actor.",
          "type": "quotation"
        },
        {
          "ref": "2004, Stephen Unwin, So You Want to be a Theatre Director?, page 77",
          "text": "In these conditions, however, you must be sensitive to the actor's need to do other work: you've got to let them go up for auditions and earn money in other ways, and only the most megalomaniac director thinks that he has 'first call' on his actors' time.",
          "type": "quotation"
        },
        {
          "ref": "2010, Ian Brown, From Tartan to Tartanry: Scottish Culture, History and Myth, page 169",
          "text": "Consequently, Harper argues, 'costume film-makers in Britain no longer had first call on their own classic novelists. […]",
          "type": "quotation"
        }
      ],
      "glosses": [
        "Priority on the use of somebody or something, especially an actor if required in a production."
      ],
      "links": [
        [
          "Priority",
          "priority"
        ],
        [
          "actor",
          "actor"
        ],
        [
          "production",
          "production"
        ]
      ],
      "tags": [
        "uncountable"
      ]
    }
  ],
  "word": "first call"
}