Being, existence (6)
I believe the answer is:
entity
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">being</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in other clues)</span><br/ ><br/ >'<span class="explanation-format__original">existence</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for entity that I've seen before include "Something existing in its own right" , "Anything that exists" , "It exists as a seperate thing (6)" , "Something with independent existence" , "Object" .)