Descendant or heir (5)
I believe the answer is:
scion
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">descendant</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that scion is a type of descendant)</span><br/ ><br/ >'<span class="explanation-format__original">heir</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ ></span>
(Other definitions for scion that I've seen before include "Issue" , "Young shoot/twig" , "Branch" , "Young child" , "Younger member of a family" .)