Crossword Genius

Spare book (7)

Ross

I believe the answer is:

reserve

This clue is a double definition.

'spare' is the first definition.
(synonyms)

'book' is the second definition.
(as in booking or reserving in advance)

(Other definitions for reserve that I've seen before include "ice" , "Hold back" , "Set aside - shyness" , "Lack of openness" , "Book - spare player" .)

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