Coxcomb (3)
I believe the answer is:
fop
'coxcomb' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for fop that I've seen before include "Man excessively concerned with fashion" , "One affected" , "'Dandy, coxcomb (3)'" , "A dandy, overdressed man" , "Gallant" .)