Collar extension (5)
I believe the answer is:
lapel
'collar extension' 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" , "Lower part of collar on coat" , "Extended part of a collar" , "Turnover at the front of a coat" , "Continuation of a coat collar" .)