Crossword Genius

A, B or C, but not X, Y or Z (4)

Ross

I believe the answer is:

note

(Other definitions for note that I've seen before include "Short personal letter" , "Observe in Eton" , "Be mindful of" , "Short communication" , "Record - piece of music" .)

I've seen this clue in the Wall Street Journal, the New York Times and the LA Times.
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