Very strong adhesive (9)
I believe the answer is:
superglue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">very strong adhesive</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 superglue that I've seen before include "Extra strong adhesive" , "Fast-bonding substance" , "Gripper" , "solution" , "that'll fix a lot of things!" .)