In addition, a hustler returned capital (5)
I believe the answer is:
hanoi
'capital' is the definition.
(capital of Vietnam)
'in addition a hustler returned' is the wordplay.
'in' indicates a hidden word.
'returned' shows that the letters should be reversed in order.
'ionah' is hidden within 'addition a hustler'.
'ionah' reversed gives 'HANOI'.
(Other definitions for hanoi that I've seen before include "Asian capital on the Red River" , "Asian city" , "Vietnamese capital" , "Vietnamese city" , "capital out East" .)