Car spy crashed in final examination (7)
I believe the answer is:
autopsy
'final examination' is the definition.
(I've seen this before)
'car spy crashed in' is the wordplay.
'car' becomes 'auto' (synonyms).
'crashed' indicates an anagram.
'in' indicates putting letters inside.
'spy' with letters rearranged gives 'psy'.
'auto' put inside 'psy' is 'AUTOPSY'.
(Other definitions for autopsy that I've seen before include "Examination after death, a post-mortem" , "Examination to determine cause of death" , "final examination" , "Examining body" , "final critical analysis" .)