Exudation from trees (5)
I believe the answer is:
resin
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">exudation from trees</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for resin that I've seen before include "Origin of amber" , "Glue" , "Rinse out this substance from trees" , "plastic material" , "Plant exudation" .)