Fashionable vehicles returning (5)
I believe the answer is:
smart
'fashionable' is the definition.
('smart' can be similar in meaning to 'fashionable')
'vehicles returning' is the wordplay.
'vehicles' becomes 'trams' (tram is a kind of vehicle).
'returning' says the letters should be written backwards.
'trams' backwards is 'SMART'.
(Other definitions for smart that I've seen before include "Neat - clever" , "Intelligent; clean, tidy" , "Chic; sting" , "Quick - trim" , "Neat, tidy; sting" .)