I'd come to be cured by doctor (6)
I believe the answer is:
medico
'doctor' is the definition.
(I know that doctor can be written as medico)
'i'd come to be cured' is the wordplay.
'to be cured' is an anagram indicator.
'id'+'come'='idcome'
'idcome' with letters rearranged gives 'MEDICO'.
'by' is the link.
(Other definitions for medico that I've seen before include "Doctor" , "quack" , "Health practitioner" .)