NT book appearing as true information (not false) (4)

I believe the answer is:

acts

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'nt book' is the definition.
(book of the New Testament)

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

(Other definitions for acts that I've seen before include "book form" , "these for variety show" , "Performances" , "Major divisions of play" , "Cast in major divisions of plays, like Shakespeare's" .)

I've seen this clue in The Everyman puzzle in The Observer.

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