Cask from Soviet Union (3)

I believe the answer is:

tun

'cask' is the definition.
(tun is a kind of cask)

'from soviet union' is the wordplay.
'from' indicates a hidden word.
'TUN' is hidden within 'soviet union'.

(Other definitions for tun that I've seen before include "Large cask for liquid" , "Cask, vat" , "Large cask (holding 252 gallons)" , "One can hold wine" , "Large cask for wine or beer" .)

I've seen this clue in The Times.

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