Book presenting facts: not the first time (4)

I believe the answer is:

ruth

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'book' is the definition.
(book of the Bible)

I cannot understand how the rest of the clue works.

(Other definitions for ruth that I've seen before include "Old word for pity, or Bible book" , "Biblical character" , "condolence" , "See 17 Down" , "she married Boaz!" .)

I've seen this clue in The Times.

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