Crossword Genius

Large cask said to weigh a lot (3)

Ross

I believe the answer is:

tun

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'large cask' is the definition.
(type of container for alcohol)

I cannot understand how the remainder of the clue works.

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(Other definitions for tun that I've seen before include "One can hold wine" , "'Large cask, for beer perhaps (3)'" , "Large cask (holding 252 gallons)" , "Quite enough wine" , "Barrel holding many gallons" .)

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