Crossword Genius

In truth a loud performance (4)

Ross

I believe the answer is:

fact

'in truth' is the definition.
(I've seen this before)

'a loud performance' is the wordplay.
'a 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 "Datum" , "Certain thing" , "Verifiable truth" , "Undisputed truth" , "matter of record" .)

I've seen this clue in the Evening Standard.
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