It's pulled by a vehicle (7)
I believe the answer is:
trailer
'it's pulled by a vehicle' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for trailer that I've seen before include "Film advertisement" , "Vehicle designed to be towed by another" , "It's pulled by a vehicle" , "Not a leading form" , "Vehicle hauled by car or truck" .)