Don visiting solitary chap, a city dweller (8)
I believe the answer is:
londoner
'a city dweller' is the definition.
(I've seen this before)
'don visiting solitary' is the wordplay.
'visiting' is an insertion indicator.
'solitary' becomes 'loner' (I've seen this in another clue).
'don' placed inside 'loner' is 'LONDONER'.
'chap' is the link.
This may not be right. It may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for londoner that I've seen before include "Dweller in UK capital" , "Native of Notting Hill or Camden, say" , "Resident of the UK capital" , "Capital citizen" , "British citizen" .)