Cure, solution (6)
I believe the answer is:
remedy
This clue is a double definition.
'cure' is the first definition.
(I know that cure can be written as remedy)
'solution' is the second definition.
(I've seen this in another clue)
(Other definitions for remedy that I've seen before include "Cure for illness" , "Medicine or therapy to cure" , "Put to rights" , "Cure or redress" , "Curative medicine" .)