Clever vehicles reversed (5)
I believe the answer is:
smart
'clever' is the definition.
(similar in meaning)
'vehicles reversed' is the wordplay.
'vehicles' becomes 'trams' (tram is a kind of vehicle).
'reversed' says the letters should be written in reverse.
'trams' written backwards gives 'SMART'.
(Other definitions for smart that I've seen before include "Elegant and stylish" , "having chips in" , "Sort of card" , "Well dressed" , "Well-dressed" .)