Projecting mouth of a bird (4)
I believe the answer is:
bill
'projecting mouth of a bird' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for bill that I've seen before include "Account; hooked weapon" , "The fellow" , "Circular - account" , "Account - used for cutting and pruning" , "Projecting mouth of a bird" .)