Cured gambler (6)
I believe the answer is:
better
I believe this clue is a double definition.
'cured' is the first definition.
(I've seen this before)
'gambler' is the second definition.
(better is a kind of gambler)
(Other definitions for better that I've seen before include "On the mend" , "Speculator" , "More acceptable" , "M ore appropriate" , "punter" .)