Vehicles that could make a fashionable comeback (5)
I believe the answer is:
trams
'vehicles' is the definition.
(tram is a kind of vehicle)
'a fashionable comeback' is the wordplay.
'a fashionable' becomes 'smart' (I've seen this in another clue).
'comeback' is a reversal indicator.
'smart' in reverse letter order is 'TRAMS'.
'that could make' is the link.
(Other definitions for trams that I've seen before include "old vehicles" , "silk yarns" , "People movers" , "public transport" , "Not seen in London" .)