Crossword Genius

Justify book having new introduction (7)

Ross

I believe the answer is:

deserve

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'justify' is the definition.
(I've seen this before)

I don't understand how the rest of the clue works.

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(Other definitions for deserve that I've seen before include "rate" , "Warrant" , "Show one is worthy" , "Be worth" , "Justify" .)

I've seen this clue in The Times.
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