City boy holding a US soldier up (6)
I believe the answer is:
saigon
'city' is the definition.
(Saigon is an example)
I don't understand how the rest of the clue works.
(Other definitions for saigon that I've seen before include "Asian city once" , "Former name of Ho Chi Minh City" , "city in Asia" , "Musical set in Vietnam war - ''Miss . . . . . .''" , "See 8" .)