University or villa site (5)

I believe the answer is:

aston

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'university' is the definition.
(university in Birmingham)

I don't understand how the rest of the clue works.

(Other definitions for aston that I've seen before include "- Villa, football club" , "A Birmingham university" , "part of Birmingham" , "district of Birmingham" , "Premiership FC" .)

I've seen this clue in the Evening Standard.

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