Document required when handing over a vehicle (10)
I believe the answer is:
conveyance
'document' is the definition.
(conveyance is a kind of document)
'handing over a vehicle' is the wordplay.
I cannot quite see how this works, but
'over' could be 'on' (physically on top of) and 'on' is present in the answer.
'a' could be 'an' and 'an' is found within the answer.
This explanation may well be incorrect...
'required when' acts as a link.
Can you help me to learn more?
(Other definitions for conveyance that I've seen before include "might be a trap" , "Legal document" .)