Gizzard (4)
I believe the answer is:
craw
'gizzard' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for craw that I've seen before include "Crop the unacceptable sticks in" , "Stomach of an animal" , "Crop of a bird" , "Bird's crop" , "Bird's pouch for storing food" .)