Crossword Genius

Not written in any key (6)

Ross

I believe the answer is:

atonal

(Other definitions for atonal that I've seen before include "Unaccented" , "Not in a key (mus.)" , "An alto (anag) - without a fixed key" , "Keyless" , "(Of music) without key" .)

I've seen this clue in the King Feature Syndicate and The Times.
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