Hired gun running amok round British city (9)
I believe the answer is:
Here is my best explanation:
'city' is the definition.
(Edinburgh is an example)
'hired gun running amok round british' is the wordplay.
'running amok' is an anagram indicator.
'round' indicates putting letters inside.
'british' becomes 'b' (abbreviation e.g. in 'BBC').
'hiredgun' anagrammed gives 'edinurgh'.
'edinurgh' placed around 'b' is 'EDINBURGH'.
(Other definitions for edinburgh that I've seen before include "fringe city", "City on the Firth of Forth", "Scotland's capital", "Scottish arts festival city", "Scottish capital", "Lothian city", "town", "Auld Reekie", "The capital of Scotland" and "Capital city of Scotland".)