Politician's powerful address? (6,3)

I believe the answer is:

number ten

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'address?' is the definition.
(home of British Prime Minister)

I can't explain the rest of the clue.

(Other definitions for number ten that I've seen before include ""Downing Street" is usually implied" , "Downing Street address" , "as part of political address" , "centre of government" , "where the PM can be found?" .)

I've seen this clue in The Guardian.

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