Crossword Genius

Losing line in tic-tac-toe (3)

Ross

I believe the answer is:

oxo

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

This is all the clue.

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

I've seen this clue in The New York Times.
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