Loudly express disapproval of an unfinished novel? (3)
I believe the answer is:
boo
'loudly express disapproval' is the definition.
'boo' can be an answer for 'disapproval' (as in a crowd booing). I'm not sure about the 'loudly express' bit.
'an unfinished novel?' is the wordplay.
'an unfinished' means to remove the last letter.
'novel?' becomes 'book' (novel is a kind of book).
'book' with its final letter taken away is 'BOO'.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for boo that I've seen before include "Negative reaction" , "Disapproving jeer" , "Shout of disapproval, maybe at ref" , "Disapproving sound" , "Catcall" .)