Crossword Genius

Only three-letter scale note (3)

Ross

I believe the answer is:

sol

'only three-letter scale note' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for sol that I've seen before include "Roman counterpart of Helios" , "Note; Peruvian currency" , "The Sun (or Campbell?)" , "The sun in Spain" , "Personification of the sun" .)

I've seen this clue in the Universal and the New York Times.
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