Large vessel or nutcracker (3)

I believe the answer is:

tun

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'large vessel' is the definition.
'tun' can be an answer for 'vessel' (type of vessel for beer). I am not sure about the 'large' bit.

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tun that I've seen before include "Large cask (holding 252 gallons)" , "Nut found in large cask" , "Quite enough wine" , "Large cask for wine or beer" , "Container of beer" .)

I've seen this clue in the Evening Standard.

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