Crossword Genius

Container for wine? (4)

Ross

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4

6
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'wine?' is the definition.
(sack is a kind of wine)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for sack that I've seen before include "Discharge" , "present holder" , "Container for coal etc" , "Wine; fire; bag" , "Plundering by a mob" .)

I've seen this clue in The Guardian and The Times.
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