City bride hung unfortunately (9)
I believe the answer is:
edinburgh
'city' is the definition.
(I know that Edinburgh is an national capital)
'bride hung unfortunately' is the wordplay.
'unfortunately' indicates anagramming the letters (a bad or unfortunate spelling).
'bride'+'hung'='bridehung'
'bridehung' anagrammed gives 'EDINBURGH'.
(Other definitions for edinburgh that I've seen before include "Scotland's capital" , "town" , "fringe city" , "City on the Firth of Forth" , "Auld Reekie" .)