Bird-dog’s sound (5)

I believe the answer is:

stork

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'bird' is the definition.
(stork is a kind of bird)

I don't understand the remainder of the clue.

(Other definitions for stork that I've seen before include "Large wading bird" , "Baby-carrying bird?" , "Mythological baby-bringer" , "The baby bird, so to speak" , "Long-legged bird" .)

I've seen this clue in the Sydney Morning Herald.

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