Vietnam's continent (4)
I believe the answer is:
asia
'vietnam's continent' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for asia that I've seen before include "It has most of the earth's population" , "A great deal of land" , "Continent in which India is situated" , "Continental land mass" , "Heavily populated area" .)