Ho Chi Minh City, formerly (6)
I believe the answer is:
saigon
'ho chi minh city formerly' 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 . . . . . .''" , "See 8" , "Asian city once" , "city in Asia" , "Former name of Ho Chi Minh City" .)