Sure is no solution to mental disorder (8)
I believe the answer is:
neurosis
'to mental disorder' is the definition.
(I've seen this before)
'sure is no solution' is the wordplay.
'sure is no' anagrams to 'NEUROSIS'.
However, I am unsure how the anagram is indicated.
Can you help me to learn more?
(Other definitions for neurosis that I've seen before include "So insure against the nervous disorder" , "Resinous sort of mental disorder" , "Mild mental condition" , "Mild mental disorder - resinous (anag)" , "Mild mental problem" .)