If you need an adhesive, this is the answer (8)
I believe the answer is:
solution
'is the answer' is the definition.
(I've seen this before)
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for solution that I've seen before include "Key" , "Elucidation - mixture of substances" , "A mixture of liquids" , "The answer to a problem" , "Answer (to a puzzle)" .)