Graves may be put here once I lower rent (4,6)

I believe the answer is:

wine cooler

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'graves may' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

'put here once i lower rent' is the wordplay.
'once i lower' can be anagrammed to 'WINE COOLER'.
Though, I'm unsure how the anagram is indicated.

'be' acts as a link.

Can you help me to learn more?

I've seen this clue in The Telegraph.

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