Is not guilty of selling drink from old capital (8)
I believe the answer is:
innocent
'is not guilty' is the definition.
('innocent' is the opposite to 'guilty')
'from old capital' is the wordplay.
'from' becomes 'in' (I've seen this in other clues).
'old capital' becomes 'nocent' (I am not sure about this - if you are sure you should believe this answer much more).
'in'+'nocent'='INNOCENT'
'of selling drink' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for innocent that I've seen before include "Virgin" , "Without sin" , "Naive person" , "not spotted" , "otherworldly?" .)