Crossword Genius

One whose voice is a muted trombone in "Peanuts" (5)

Ross

I believe the answer is:

adult

(Other definitions for adult that I've seen before include "Supposedly "responsible" person" , "Indecent" , "(Of an animal) fully developed" , "Mature - grown-up" , "I wasn't born yesterday" .)

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