Swanky, upmarket (4)
I believe the answer is:
posh
This clue is a double definition.
'swanky' is the first definition.
(I've seen this in another clue)
'upmarket' is the second definition.
(I've seen this before)
(Other definitions for posh that I've seen before include "'opulent'" , "Smart, fashionable" , "Upmarket" , "Luxuriously stylish" , "refined" .)