Dramatist extensive about Latin (5)
I believe the answer is:
wilde
'dramatist' is the definition.
(I know that Wilde is a dramatist)
'extensive about latin' is the wordplay.
'extensive' becomes 'wide' (similar in meaning).
'about' indicates putting letters inside.
'latin' becomes 'l'.
'wide' placed around 'l' is 'WILDE'.
(Other definitions for wilde that I've seen before include "Oscar, great Irish writer" , "Irish wit and playwright" , "Oscar --, writer and wit" , "Author of The Portrait of Dorian Gray" , "Author of The Picture of Dorian Gray" .)