No longer in existence (7)
I believe the answer is:
extinct
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">no longer in existence</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(Other definitions for extinct that I've seen before include "Ended" , "never to be seen again" , "Of volcano, no longer active" , "Defunct" , "No more vital" .)