Crossword Genius

In sudoku, a three by three block (5)

Ross

I believe the answer is:

nonet

(Other definitions for nonet that I've seen before include "Composition for nine players" , "Tonne (anag.); music for a group" , "Piece for nine players" , "Band of nine?" , "piece to be performed" .)

I've seen this clue in The Times.
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