Crossword Genius

Busy signals, e.g. (5)

Ross

I believe the answer is:

tones

(Other definitions for tones that I've seen before include "Qualities of colour, music or speech" , "Tints of colour" , "Qualities of people's voices" , "Told about the silly ass" , "Shades" .)

I've seen this clue in The New York Times.
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