A playwright starts to introduce boring scenes expressing nothing (5)
I believe the answer is:
ibsen
'a playwright' is the definition.
(I know that Ibsen is a playwright)
'starts to introduce boring scenes expressing nothing' is the wordplay.
'starts to' says to take the initial letters.
The first letters of 'introduce boring scenes expressing nothing' is 'IBSEN'.
(Other definitions for ibsen that I've seen before include ""Doll's House" dramatist" , "Norse playwright" , "Norwegian playwright (Peer Gynt)" , "Scandinavian playwright" , "foreign author" .)