Bird's call for service in New York? (5)

I believe the answer is:

wader

'bird's' is the definition.
(wader is a kind of bird)

I can't explain the rest of the clue.

(Other definitions for wader that I've seen before include "crane, perhaps" , "High waterproof boot" , "Bird such as a sandpiper or plover" , "Eg, sandpiper, flamingo" , "Long-legged shore bird" .)

I've seen this clue in The Guardian.

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