Poorly, I'd come for doctor (6)
I believe the answer is:
medico
'for doctor' is the definition.
(synonyms)
'poorly i'd come' is the wordplay.
'poorly' indicates anagramming the letters (a poor spelling).
'id'+'come'='idcome'
'idcome' anagrammed gives 'MEDICO'.
(Other definitions for medico that I've seen before include "quack" , "Health practitioner" , "Doctor" .)