Betel nut tree
I believe the answer is:
areca
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">betel nut tree</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 areca that I've seen before include "Palm-nut" , "Sort of nut" , "Palm with red nuts" , "palm-tree" , "Tropical palm" .)