Smart, fashionable (4)
I believe the answer is:
chic
I believe this clue is a double definition.
'smart' is the first definition.
(both can mean stylish)
'fashionable' is the second definition.
(chic means stylish or fashionable)
(Other definitions for chic that I've seen before include "Smart and stylish, in a French kind of way" , "In vogue" , "Snazzy" , "Smart - elegant - fashionable" , "Modish" .)