Cry of a ravenous bird! (3)
I believe the answer is:
caw
'cry' is the definition.
(caw is a kind of cry)
I can't explain the remainder of the clue.
Can you help me to learn more?
(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" .)