Crossword Genius

Based on fact (4)

Ross

I believe the answer is:

true

'based on fact' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for true that I've seen before include "In accordance with facts" , "Real; accurate" , "Exact; faithful" , "Veracious" , "to be believed?" .)

I've seen this clue in The Mirror and The Guardian.
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