Crossword Genius

Volume; reserve (4)

Ross

I believe the answer is:

book

This clue is a double definition.

'volume' is the first definition.
(I know that volume can be written as book)

'reserve' is the second definition.
(to book something is to reserve it)

(Other definitions for book that I've seen before include "strict regulations" , "Strict rules" , "Reserve - bets taken on a race" , "Paperback" , "Reserve (tickets)" .)

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