Fop, beau (5)
I believe the answer is:
dandy
I believe this clue is a double definition.
'fop' is the first definition.
(I know that fop can be written as dandy)
'beau' is the second definition.
(I know that beau can be written as dandy)
(Other definitions for dandy that I've seen before include "Fashionable fellow" , "Fine for American" , "First-rate - fop" , "Foppish man" , "Marathon running strips" .)