Vehicle not back in container (6)
I believe the answer is:
carton
'container' is the definition.
(I know that carton is a type of container)
'vehicle not back' is the wordplay.
'vehicle' becomes 'car' (car is a kind of vehicle).
'back' says the letters should be written backwards.
'not' backwards is 'ton'.
'car'+'ton'='CARTON'
'in' is the link.
(Other definitions for carton that I've seen before include "Sydney -, Tale of Two Cities hero" , "Container for food or liquid" , "Dickensian hero" , "Light cardboard box" , "Small, light box or container" .)