Nothing; put an end to (3)

I believe the answer is:

nix

I believe this is a double definition.

'nothing' is the first definition.
(nix can mean nothing)

'put an end to' is the second definition.
(I've seen this in another clue)

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

I've seen this clue in The Times.

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