Dramatist Ben is drunk (5)
I believe the answer is:
'dramatist' is the definition.
(Ibsen is an example)
'ben is drunk' is the wordplay.
'drunk' is an anagram indicator.
'benis' is an anagram of 'IBSEN'.
(Other definitions for ibsen that I've seen before include "Scandinavian playwright" , "Is Ben a playwright?" , "Henrik -, dramatist from fourteen down (Hedda Gabler)" , "Norwegian dramatist, d. 1906" , "Noted Norwegian playwright" .)