Brussels airs a realignment of major land mass (7)
I believe the answer is:
eurasia
'land mass' is the definition.
(I've seen this in another clue)
'brussels airs a realignment of major' is the wordplay.
I cannot really understand how this works, but
'brussels' could be 'eu' (European Parliament is based in Brussels) and 'eu' is located in the answer.
an anagram of 'airs' is 'rasi' which is located in the answer.
'a' is present in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for eurasia that I've seen before include "Large expanse of land" , "Two continents considered as one" , "Large landmass combining two continents" , "Landmass extending west-east from Cape Roca to Cape Dezhnev" , "Huge area" .)