Adhesive substance (4)
I believe the answer is:
glue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">adhesive substance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for glue that I've seen before include "agent with sticking power" , "Adhesive substance" , "Fixative" , "size" , "Bond" .)