Crossword Genius

Nut container? (3)

Ross

I believe the answer is:

tun

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'container?' is the definition.
(type of cask)

'nut' is the wordplay.
'nut' can be anagrammed to 'TUN'.
But, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for tun that I've seen before include "butt" , "Large cask for wine or beer" , "'Large cask, for beer perhaps (3)'" , "Nut found in large cask" , "Cask, vat" .)

I've seen this clue in the Evening Standard.
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