Fashionably old-fashioned (5)
I believe the answer is:
retro
'fashionably old-fashioned' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for retro that I've seen before include "Imitating an older style" , "Predatory fish" , "recapturing the past" , "Looking back" , "bit of nostalgia" .)