Tree-dwelling (8)
I believe the answer is:
arboreal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">tree-dwelling</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for arboreal that I've seen before include "found in 20 [TREETOP] ?" , "Pertaining to trees" , "found in branches" , "Inhabiting trees" , "high living" .)