Acoustic quality of a wrong note (4)

I believe the answer is:

tone

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

'acoustic quality' is the definition.
'tone' can be an answer for 'quality' (synonyms). I'm not sure about the 'acoustic' bit.

'wrong note' is the wordplay.
'wrong' indicates anagramming the letters.
'note' is an anagram of 'TONE'.

'of a' is the 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.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.