Loads a vehicle leaves (7)
I believe the answer is:
cargoes
'loads' is the definition.
('cargo' can be a synonym of 'load')
'a vehicle leaves' is the wordplay.
'a vehicle' becomes 'car' (car is a kind of vehicle).
'leaves' becomes 'goes' (I've seen this before).
'car'+'goes'='CARGOES'
(Other definitions for cargoes that I've seen before include "Ships' loads" , "Carried loads" .)