Prefect turned model (7)
I believe the answer is:
perfect
'model' is the definition.
(thesaurus)
'prefect turned' is the wordplay.
'turned' is an anagram indicator.
'prefect' with letters rearranged gives 'PERFECT'.
(Other definitions for perfect that I've seen before include "Faultless" , "Without blemish" , "Exemplary" , "Past tense; ideal" , "Complete" .)