Chaos or confusion (5)
I believe the answer is:
havoc
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">chaos</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">confusion</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for havoc that I've seen before include "Violent and needless disturbance" , "Widepsread destruction" , "Carnage" , "Chaotic devastation" , "desolation" .)