Irish playwright (5)
I believe the answer is:
wilde
'irish playwright' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for wilde that I've seen before include "Irish dramatist and wit" , "He wrote The Ballad of Reading Gaol" , "Oscar --, English writer" , "Author of The Picture of Dorian Gray" , "Oscar --, writer and wit" .)