Rogue doctor accepted by newly-trained counsel (9)
I believe the answer is:
scoundrel
'rogue' is the definition.
(thesaurus)
'doctor accepted by newly-trained counsel' is the wordplay.
'doctor' becomes 'dr' ('Dr' can be a synonym of 'doctor').
'accepted by' is an insertion indicator.
'newly trained' indicates anagramming the letters.
'counsel' anagrammed gives 'scounel'.
'dr' put inside 'scounel' is 'SCOUNDREL'.
(Other definitions for scoundrel that I've seen before include "bad egg" , "Person that's low" , "Knave" , "Villain" , "Hound" .)