Stop, halt (5)
I believe the answer is:
cease
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">stop</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">halt</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for cease that I've seen before include "Stop, finish" , "Desist" , "Stop, give over" , "Political group" , "Come to an end" .)