Crossword Genius

Highest sudoku digit (4)

Ross

I believe the answer is:

nine

'highest sudoku digit' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for nine that I've seen before include "3x3" , "Three squared" , "It's dialled three times in an emergency" , "Short time for a wonder" , "'Possession is... points of the law'" .)

I've seen this clue in the LA Times and the Newsday.
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