Crossword Genius

Loud performance, it's true (4)

Ross

I believe the answer is:

fact

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

'loud performance' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'performance' becomes 'act' (act is a kind of performance).
'f'+'act'='FACT'

(Other definitions for fact that I've seen before include "matter of record" , "Not fake news!" , "It's certainly not fiction" , "Datum" , "Something known to be true" .)

I've seen this clue in The Mirror, The Sun and The Daily Express.
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