Counsellor drives a wreck (7)
I believe the answer is:
adviser
'counsellor' is the definition.
(I've seen this before)
'drives a wreck' is the wordplay.
'wreck' indicates anagramming the letters.
'drives'+'a'='drivesa'
'drivesa' is an anagram of 'ADVISER'.
(Other definitions for adviser that I've seen before include "Counseller" , "subject's specialist consultant" , "Guide" , "ID saver (anag.)" , "Counsellor, mentor" .)