Check temperature underneath car (5)
I believe the answer is:
audit
'check' is the definition.
(thesaurus)
'temperature underneath car' is the wordplay.
'temperature' becomes 't' (abbreviation).
'underneath' is a charade indicator (letters next to each other) (I've seen this in other clues).
'car' becomes 'audi' (audi is a german car brand).
't' put after 'audi' is 'AUDIT'.
(Other definitions for audit that I've seen before include "Inspection of a company's books" , "Financial investigation" , "Examination of accounts" , "Official inspection of company accounts" , "Inspect accounts" .)