Crossword Genius

Book cover (7)

Ross

I believe the answer is:

binding

'book cover' is the definition.
(I know that book cover can be written as binding)

This is the entire clue.

(Other definitions for binding that I've seen before include "Mandatory" , "Obligatory" , "work for a bookmaker" .)

I've seen this clue in The Telegraph and The Mirror.
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