Put the kibosh on (3)
(Other definitions for end that I've seen before include "scrap" , "Extreme" , "Aim - point - finish" , "Complete" , "SECOND PART OF 10" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">put the kibosh on</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for nix that I've seen before include "Cancel" , "water sprite" , "Nothing (sl.)" , "0" , "Spiteful water spirit" .)