Cop — male cop in complex (9)
I believe the answer is:
policeman
'cop' is the definition.
(thesaurus)
'male cop in complex' is the wordplay.
'complex' indicates anagramming the letters.
'male'+'cop'+'in'='malecopin'
'malecopin' is an anagram of 'POLICEMAN'.
(Other definitions for policeman that I've seen before include "Menial cop (anag)" , "Member of the Garda, say" , "Bobby" , "Constable" , "Law enforcer" .)