Crossword Genius

Fiction's opposite (4)

Ross

I believe the answer is:

fact

'fiction's opposite' 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 "Indisputable thing" , "An indisputable truth" , "copyright protection agency?" , "It's certainly not fiction" , "Truth, reality" .)

I've seen this clue in the USA Today and The New York Times.
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