Put the kibosh on (3)

I think it could be either:

end

nix

(Other definitions for end that I've seen before include "scrap" , "Extreme" , "Aim - point - finish" , "Complete" , "SECOND PART OF 10" .)

I've seen this clue in The New York Times, the USA Today, the LA Times, The Wall Street Journal and the King Feature Syndicate.

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