Two continents considered as one (7)
I believe the answer is:
eurasia
'two continents considered as one' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for eurasia that I've seen before include "Land mass - use aria (anag)" , "World's largest land mass" , "Turkey, and so on" , "large bloc of countries" , "Large landmass combining two continents" .)