Express disapproval of king's literary work (4)
I believe the answer is:
book
'literary work' is the definition.
(I've seen this in another clue)
'express disapproval of king's' is the wordplay.
'express disapproval of' becomes 'boo' (I've seen this before).
'king' becomes 'k' (abbreviation for king in chess).
'boo'+'k'='BOOK'
(Other definitions for book that I've seen before include "Reading volume" , "Written work; reserve" , "Hardback, say" , "Paperback" , "Reserve; tome" .)