Body of Dave, discovered in car (7)
I believe the answer is:
cadaver
'body' is the definition.
(I know that body can be written as cadaver)
'dave discovered in car' is the wordplay.
'discovered in' is an insertion indicator.
'dave' going inside 'car' is 'CADAVER'.
'of' acts as a link.
(Other definitions for cadaver that I've seen before include "Remains of a human" , "Dead body, corpse" , "Dead human body" , "Human body dissected by medical students" , "Stiff" .)