Death, downfall (4)
I believe the answer is:
doom
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">death</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">downfall</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for doom that I've seen before include "Unavoidable ill-fortune" , "Death, destruction" , "Curse" , "Bad destiny" , "Mood of grim fate" .)