Crop of a bird (4)
I believe the answer is:
craw
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">crop of a bird</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for craw that I've seen before include "Crop the unacceptable sticks in" , "Stomach of an animal" , "Gizzard" , "Bird's crop" , "throat" .)