Jacket flap (5)
I believe the answer is:
lapel
'jacket flap' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lapel that I've seen before include "top of coat" , "Jacket fold" , "Lower extension of collar on jacket or coat" , "Part of a suit jacket" , "Folded flap at front of jacket or coat" .)