Nonbinary possessive (5)
I believe the answer is:
their
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nonbinary possessive</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for their that I've seen before include "Belonging to him (perhaps wrongly)" , "Relating to them" , "Belonging to those people" , "Those people's" , "Possessive pronoun" .)