Crossword Genius

Quartet minus one (4)

Ross

I believe the answer is:

trio

'quartet minus one' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for trio that I've seen before include "Three together" , "Three of a kind" , "Chamber group" , "wise men?" , "Group of Magi?" .)

I've seen this clue in the Universal, the USA Today, the Newsday and The New York Times.
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