Rewarding version of vital cure (9)
I believe the answer is:
lucrative
'rewarding' is the definition.
(thesaurus)
'version of vital cure' is the wordplay.
'version of' indicates anagramming the letters.
'vital'+'cure'='vitalcure'
'vitalcure' with letters rearranged gives 'LUCRATIVE'.
(Other definitions for lucrative that I've seen before include "Making a great profit" , "rewarding" , "Making money" , "Revictual (anag.)" , "Producing a sizeable profit" .)