Cure, make better (4)
I believe the answer is:
heal
This clue is a double definition.
'cure' is the first definition.
(I know that cure can be written as heal)
'make better' is the second definition.
(I've seen this before)
(Other definitions for heal that I've seen before include "Cure, make well" , "Make better" , "remedy" , "Get well again" , "Get healthy again" .)