Crossword Genius

It's in the definitions of "stalemate" and "sour grapes" (6)

Ross

I believe the answer is:

cannot

(Other definitions for cannot that I've seen before include "Canton (anag.)" , "Is not in a position to" , "Is unabe to" , "Is unable to" , "Is not able to" .)

I've seen this clue in the Newsday.
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