End of life (5)
I believe the answer is:
death
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">end of life</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for death that I've seen before include "Last moment of existence" , "The end - after 13 across, the plague" , "Extinction" , "Loss of life" , "Final moments" .)