Jeans pouching one cut-off book (9)

I believe the answer is:

leviticus

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'book' is the definition.
(I know that Leviticus is a book)

I can't explain the rest of the clue.

(Other definitions for leviticus that I've seen before include "Limit" , "I cut evils (anag) - book of the Old Testament" , "Book of the Bible" , "Third book of the Old Testament - I cut Elvis (anag)" , "Religious text" .)

I've seen this clue in the Sydney Morning Herald.

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