Pious emperor and dramatist (6)
I believe the answer is:
pinero
'dramatist' is the definition.
(I've seen this before)
'pious emperor' is the wordplay.
'pious' becomes 'pi'.
'emperor' becomes 'nero' (Roman emperor).
'pi'+'nero'='PINERO'
'and' is the link.
(Other definitions for pinero that I've seen before include "Arthur Wing --, English dramatist" , "Sir Arthur Wing -, British playwright" , "Sir 4 Wing ---, dramatist" .)