Crossword Genius

Tic-tac-toe nonwinner (3)

Ross

I believe the answer is:

oxo

'tic-tac-toe nonwinner' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for oxo that I've seen before include "Stock cube brand" , "Proprietary brand of beef cube" .)

I've seen this clue in the Newsday.
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