Cure found in extreme dysfunction (6)
I believe the answer is:
remedy
'cure' is the definition.
(I know that cure can be written as remedy)
'in extreme dysfunction' is the wordplay.
'in' indicates a hidden word.
'REMEDY' is hidden within 'extreme dysfunction'.
'found' acts as a link.
(Other definitions for remedy that I've seen before include "fix" , "Medicine or therapy that cures disease or relieves pain" , "'Cure, medicine (6)'" , "Countermeasure" , "Antidote" .)