Oscar --, Irish playwright (5)
I believe the answer is:
wilde
I believe this is a double definition.
'oscar' is the first definition.
(playwright Oscar Wilde)
'irish playwright' is the second definition.
(I know that Wilde is a dramatist)
(Other definitions for wilde that I've seen before include "Author of The Picture of Dorian Gray" , "Oscar --, playwright, wit and author" , "He wrote The Ballad of Reading Gaol" , "Oscar --, dramatist" , "Oscar, great Irish writer" .)