Former federation
I believe the answer is:
ussr
'former federation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for ussr that I've seen before include "Former association of communist republics" , "Country established in1922 and dissolved in 1991, in short" , "Former federation of Russial and other states" , "Former union of socialist republics" , "Former Soviet Union" .)