Crossword Genius

In music, a symbol denoting a sharp, flat, or natural that is not a part of the key signature (10)

Ross

I believe the answer is:

accidental

(Other definitions for accidental that I've seen before include "Chance, inadvertent" , "indication to modify tone slightly" , "change of key" , "Possible sharp" , "Subsidiary" .)

I've seen this clue in The Independent.
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