Recover from op - cure's radical (6)
I believe the answer is:
recoup
'recover' is the definition.
('recoup' can be a synonym of 'recover')
'op cure's radical' is the wordplay.
'radical' is an anagram indicator.
'op'+'cure'='opcure'
'opcure' anagrammed gives 'RECOUP'.
'from' is the link.
(Other definitions for recoup that I've seen before include "Recover, losses perhaps" , "Get back again, say losses (6)" , "recover money" , "Reimburse or compensate" , "Regain a loss through subsequent profits" .)