Crossword Genius

Not infrequently, a wrong note comes out loud! (5)

Ross

I believe the answer is:

often

I'm a little stuck... Click here to teach me more about this clue!

'not infrequently' is the definition.
('often' is the opposite to 'infrequently')

'a wrong note comes out loud' is the wordplay.
I cannot quite see how this works, but
'note' could be 'te' (musical note) and 'te' is found in the answer.
'loud' could be 'f' (short for forte - 'loud' in music) and 'f' is present in the answer.
The remaining letters 'on' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for often that I've seen before include "Turn away" , "Frequent" , "A great deal" , "A lot" , "More than occasionally" .)

I've seen this clue in the Evening Standard.
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