Gum (5)
I believe the answer is:
resin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gum</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 resin that I've seen before include "Material exuded from tree" , "Sticky stuff as from pine tree" , "Contributor to plastics industry" , "Sticky substance exuded by pine trees" , "Substance produced from sap of some plants and trees" .)