Former Southeast Asian capital (6)
I believe the answer is:
saigon
'former southeast asian capital' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for saigon that I've seen before include "Musical set in Vietnam war - ''Miss . . . . . .''" , "Former name of Ho Chi Minh City" , "Asian city once" , "See 8" , "city in Asia" .)