Pointed comment (4)
I believe the answer is:
barb
'pointed comment' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for barb that I've seen before include "Jibe" , "Point of fish-hook - gibe" , "Arrowhead projection" , "Pointed part - gibe" , "Deliberately hurtful remark" .)