Crossword Genius

Highest sudoku number (4)

Ross

I believe the answer is:

nine

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

This is the entire clue.

(Other definitions for nine that I've seen before include "Three squared" , "and 23: Flash in the pan" , "'Possession is... points of the law'" , "A perfect square" , "Number of feline existences" .)

I've seen this clue in the USA Today and the Jonesin'.
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