Crossword Genius

The constructors of this puzzle, e.g.

Ross

I believe the answer is:

trio

(Other definitions for trio that I've seen before include "Group of three (musicians)" , "Ensemble musical piece, eg Beethoven's 'Archduke'" , "Threesome" , "Three together" , "Beethoven's 'Archduke', for example" .)

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