Check I'd reversed in car? Not entirely (5)
I believe the answer is:
audit
'check' is the definition.
(an audit is an examination or check)
'i'd reversed in car? not entirely' is the wordplay.
'reversed' is a reversal indicator.
'in' indicates putting letters inside.
'car?' becomes 'auto' (synonyms).
'not entirely' means to remove the last letter (not all of the word).
'id' reversed gives 'di'.
'auto' with its last letter removed is 'aut'.
'di' placed within 'aut' is 'AUDIT'.
(Other definitions for audit that I've seen before include "Official inspection of company accounts" , "review of books" , "special ale" , "Go over" , "Financial review" .)