Authoritative book (5)

I believe the answer is:

bible

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

This is all the clue.

(Other definitions for bible that I've seen before include "The Christian or Jewish scriptures" , "Holy books" , "An authoritative text" , "Holy Scripture" , "Authoritative book" .)

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

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