Crossword Genius

Book that's difficult to endorse? (8)

Ross

I believe the answer is:

hardback

'book' is the definition.
(I know that hardback is a type of book)

'difficult to endorse?' is the wordplay.
'difficult' becomes 'hard' (synonyms).
'to endorse?' becomes 'back' (synonyms).
'hard'+'back'='HARDBACK'

'that's' is the link.

(Other definitions for hardback that I've seen before include "Book with board covers" , "It might be a novel!" , "Penguins are rarely so" , "Book with stiff covers" , "Sort of book" .)

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