Vehicle is really a vehicle towed by another (7)
I believe the answer is:
caravan
'vehicle' is the definition.
(caravan is a kind of vehicle)
'really a vehicle towed by another' is the wordplay.
I cannot quite see how this works, but
'a' could be 'an' and 'an' is located in the answer.
'another' could be 'car' (I've seen this in other clues) and 'car' is found within the answer.
This explanation may well be incorrect...
'is' is the link.
Can you help me to learn more?
(Other definitions for caravan that I've seen before include "Group of desert voyagers" , "Camel train" , "Towed home" , "House on wheels" , "Towable home" .)