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Stock
of
wine
merchant
delivered
(6)
Stock of wine merchant delivered (6)
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The definition is at the beginning of the clue.
How the clue works
Look at Stock of wine — that's your definition, since a cellar is exactly where you'd stash your bottles. The rest of the clue is playing on sound: "merchant" gives you "seller", and "delivered" is the nod telling you to read it aloud, so "seller" comes out sounding just like CELLAR.