Fashionable new bar (3)
I believe the answer is:
inn
'bar' is the definition.
(I've seen this in other clues)
'fashionable new' is the wordplay.
'fashionable' becomes 'in' ('in' can be similar in meaning to 'fashionable').
'new' becomes 'n'.
'in'+'n'='INN'
(Other definitions for inn that I've seen before include "European river" , "Old hostelry for travellers" , "Swiss river" , "watering-hole" , "Small hotel or country pub" .)