What's left in the car? (6)
I believe the answer is:
estate
This clue is a double definition.
'what's left' is the first definition.
(what's left behind by a deceased person)
'the car?' is the second definition.
(type of car)
'in' acts as a link.
(Other definitions for estate that I've seen before include "Scheme of new housing" , "Property to be inherited" , "Property - tea set (anag)" , "All that one owns at death" , "Tea-set (anag.)" .)