Wine Society leaves jar (4)

I believe the answer is:

hock

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'wine' is the definition.
(hock is a kind of wine)

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

(Other definitions for hock that I've seen before include "Hamstring" , "Buy property, say" , "White wine and horse's joint" , "Animal joint - German white wine" , "Dry wine; joint; pawn" .)

I've seen this clue in The Sun.

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