An Asian country also varies (4)
I believe the answer is:
laos
'an asian country' is the definition.
(country in Asia)
'also varies' is the wordplay.
'varies' indicates anagramming the letters.
'also' with letters rearranged gives 'LAOS'.
(Other definitions for laos that I've seen before include "Asian country, capital Vientiane" , "Republic in southeastern Asia" , "Country of SE Asia" , "Republic of southeast Asia" , "Landlocked south-east Asian country" .)