Crossword Genius

Book to lay aside (7)

Ross

I believe the answer is:

reserve

This clue is a double definition.

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

'lay aside' is the second definition.
(thesaurus)

'to' acts as a link.

(Other definitions for reserve that I've seen before include "not in the front line" , "put to one side" , "Modesty- store" , "Savings - book" , "Keep for future use" .)

I've seen this clue in The Sun.
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