Sound a cracked note (4)

I believe the answer is:

tone

'sound' is the definition.
(I know that tone is a type of sound)

'a cracked note' is the wordplay.
'a cracked' indicates an anagram.
'note' with letters rearranged gives 'TONE'.

(Other definitions for tone that I've seen before include "Mood" , "Quality of a musical or vocal sound" , "Theobald Wolf . . . ." , "Pitch (sound)" , "Vocal sound of note" .)

I've seen this clue in the Evening Standard.

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