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