Unorthodox book (5)
I believe the answer is:
novel
This clue might be a double definition.
'unorthodox' is the first definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?
'book' is the second definition.
(I know that novel is a type of book)
Can you help me to learn more?
(Other definitions for novel that I've seen before include "New piece of fiction?" , "Innovative" , "story" , "Kim, eg" , "work of Dickens?" .)