Time to drive into vehicle (4)
I believe the answer is:
tram
'vehicle' is the definition.
(tram is a kind of vehicle)
'time to drive into' is the wordplay.
'time' becomes 't' (abbreviation).
'to drive into' becomes 'ram' (I've seen this in another clue).
't'+'ram'='TRAM'
(Other definitions for tram that I've seen before include "Street vehicle running on rails" , "Rail vehicle" , "multi-faceted yarn" , "Passenger vehicle on rails" , "Take it to the mart" .)