It's true! (4)

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5 1,3,3,3

fact

'it's true' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for fact that I've seen before include "Truth, reality" , "True statement" , "It's certainly not fiction" , "Indisputable thing" , "Certain thing" .)

I've seen this clue in The New York Times.

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