"Back in the ___" (Beatles song) (4)

I believe the answer is:

ussr

(Other definitions for ussr that I've seen before include "The Beatles? song 'Back in the . . . .'" , "Former federation of Russial and other states" , "Former soviet states" , "In brief, former Soviet federation" , "Former association of communist republics" .)

I've seen this clue in the Universal.

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