The largest country in the world (6)
I believe the answer is:
russia
'the largest country in the world' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for russia that I've seen before include "East European country" , "Country from which came James Bond's love?" , "Former Communist country of eastern Europe and northern Asia" , "Permanent member of the UN Security Council" , "Find US sari strangely in this country" .)