Corpse man found in vehicle (7)
I believe the answer is:
cadaver
'corpse' is the definition.
(synonyms)
'man found in vehicle' is the wordplay.
'man' becomes 'dave' (I've seen this before).
'found in' is an insertion indicator.
'vehicle' becomes 'car' (car is a kind of vehicle).
'dave' inserted within 'car' is 'CADAVER'.
(Other definitions for cadaver that I've seen before include "Human body dissected by medical students" , "Stiff" , "A kind of corpse" , "Remains of a human" , "Human corpse" .)