Acoustic quality of a wrong note (4)

I believe the answer is:

tone

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'acoustic quality' is the definition.
'tone' can be an answer for 'quality' (synonyms). I am not certain of the 'acoustic' bit.

'wrong note' is the wordplay.
'wrong' is an anagram indicator.
'note' anagrammed gives 'TONE'.

'of a' acts as a link.

Can you help me to learn more?

(Other definitions for tone that I've seen before include "Sound signal on a telephone" , "Shade" , "Musical sound; quality of hue" , "Bodily firmness" , "Pitch or timbre" .)

I've seen this clue in the Evening Standard.

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