Hope one’s somehow done with book — the novel I detest (8)
I believe the answer is:
'the novel i detest' is the definition.
(someone who hates new or novel things)
'hope one's somehow done with book' is the wordplay.
'somehow done with' indicates anagramming the letters (letters done in some other way).
'book' becomes 'b' (abbreviation for book).
'hopeone' with its letters anagrammed with 'b' can make 'NEOPHOBE'.
(Other definitions for neophobe that I've seen before include "One disliking the new" , "Traditionalist" .)