Crossword Genius

Reserve copy (4)

Ross

I believe the answer is:

book

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This clue could be a double definition.

'reserve' is the first definition.
(synonyms)

'copy' is the second definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?

Can you help me to learn more?

(Other definitions for book that I've seen before include "See 1 ac" , "Reserve - something to read" , "Quick work" , "Leaves, bound" , "Tome, volume" .)

I've seen this clue in The Sun.
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