Cry of a ravenous bird! (3)

I believe the answer is:

caw

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'cry' is the definition.
(caw is a kind of cry)

I can't explain the remainder of the clue.

(Other definitions for caw that I've seen before include "Crow's cry" , "Rook's cry" , "Cry of a rook" , "Rook's call" , "Harsh cry of a crow" .)

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