Graves found below the ground here? (4,6)

I believe the answer is:

wine cellar

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'graves found below the ground here?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

This is all the clue.

Can you help me to learn more?

(Other definitions for wine cellar that I've seen before include "Storage space" , "Drink stock" , "Store for burgundy etc" .)

I've seen this clue in The Independent.

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