Capital person academic introduced to unsociable guy (8)
I believe the answer is:
londoner
'capital person' is the definition.
'academic introduced to unsociable guy' is the wordplay.
'academic' becomes 'don' (type of academic - especially at Oxbridge).
'introduced to' indicates putting letters inside.
'unsociable guy' becomes 'loner' (I am not sure about this - if you are sure you should believe this answer much more).
'don' placed into 'loner' is 'LONDONER'.
Can you help me to learn more?
(Other definitions for londoner that I've seen before include "Person from England's capital" , "One from UK's capital" , "Resident of the UK capital" , "city dweller" , "Inhabitant of capital" .)