Put the kibosh on (3)

I think it could be either:

end

nix

'put the kibosh on' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for nix that I've seen before include "Cancel" , "water sprite" , "Nothing (sl.)" , "0" , "Spiteful water spirit" .)

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

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