Book of Leviticus about to be reviewed (5)
I believe the answer is:
novel
'book' is the definition.
(novel is a kind of book)
'leviticus about to be reviewed' is the wordplay.
'leviticus' becomes 'lev' (I can't explain this - if you can you should believe this answer much more).
'about' becomes 'on'.
'to be reviewed' shows that the letters should be reversed in order.
'lev'+'on'='levon'
'levon' back-to-front is 'NOVEL'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for novel that I've seen before include "work of Dickens?" , "Volume of prose fiction" , "Hitherto unknown" , "Fresh" , "Kim, eg" .)