Swell railway: just the place for a doctor (7)
I believe the answer is:
surgery
'just the place for a doctor' is the definition.
'swell railway' is the wordplay.
'swell' becomes 'surge' (I've seen this before).
'railway' becomes 'ry' (abbreviation for railway).
'surge'+'ry'='SURGERY'
(Other definitions for surgery that I've seen before include "Branch of medicine" , "Doctor's consulting room" , "operation" , "Doctor's premises" , "consult your MP here" .)