Knight has bizarre love for book (5)
I believe the answer is:
novel
'for book' is the definition.
(novel is a kind of book)
'knight has bizarre love' is the wordplay.
'knight' becomes 'N' (chess abbreviation).
'has' says to put letters next to each other.
'bizarre' is an anagram indicator.
'love' with letters rearranged gives 'ovel'.
'n'+'ovel'='NOVEL'
(Other definitions for novel that I've seen before include "Book of prose fiction" , "Rebecca?" , "Fictional work" , "Romance - new" , "piece of writing" .)