Sticking point, metaphorically (4)
I believe the answer is:
craw
'sticking point metaphorically' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for craw that I've seen before include "Gizzard" , "Bird's crop" , "Stomach of an animal" , "throat" , "Crop of a bird" .)