House eleven in Aston (5)

I believe the answer is:

villa

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'house' is the definition.
(I know that villa is a type of country house)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for villa that I've seen before include "Country house in Italy or France" , "Holiday residence" , "See 3" , "Roman or suburban house" , "Classical country house" .)

I've seen this clue in The Telegraph.

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