Dramatist in one book Sterne regularly shunned (5)
I believe the answer is:
ibsen
'dramatist' is the definition.
(I know that Ibsen is a dramatist)
'one book sterne regularly shunned' is the wordplay.
'one' becomes 'I' (Roman numeral).
'book' becomes 'b' (abbreviation for book).
'regularly shunned' indicates alternate letters (letters removed at regular intervals).
The alternating letters of 'sterne' are 'sen'.
'i'+'b'+'sen'='IBSEN'
'in' is the link.
(Other definitions for ibsen that I've seen before include ""Doll's House" dramatist" , "Author of The Master Builder, d. 1906" , "Norwegian playwright (Peer Gynt)" , "Is Ben a playwright?" , "Norwegian dramatist and poet" .)