Vientiane's country (4)
I believe the answer is:
laos
'vientiane's country' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for laos that I've seen before include "Mountainous state in southeastern Asia" , "Landlocked state in southeastern Asia" , "Republic of southeast Asia" , "South-east Asian republic, capital Vientiane" , "Asian country, capital Vientiane" .)