Republic in SE Asia whose capital is Vientiane (4)

I believe the answer is:

laos

(Other definitions for laos that I've seen before include "Country of SE Asia" , "Landlocked state in southeastern Asia" , "Country of Indo-China, capital Vientiane" , "South-east Asian republic, capital Vientiane" , "Landlocked south-east Asian country" .)

I've seen this clue in The Mirror.

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