Original — book (5)
I believe the answer is:
novel
I believe this clue is a double definition.
'original' is the first definition.
('novel' can be similar in meaning to 'original')
'book' is the second definition.
(novel is a kind of book)
(Other definitions for novel that I've seen before include "Fictitious prose work" , "strange possibly" , "Book of prose fiction" , "New and intriguing" , "Of a kind not seen before" .)