Crossword Genius

A book to be critically examined but not bought (6,4)

Ross

I believe the answer is:

review copy

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'a book' is the definition.
Both the answer and definition are singular nouns.
Maybe there's a link between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Another definition for review copy that I've seen is " Book sent to, eg, newspaper".)

I've seen this clue in The Globe and Mail.
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