Villa site in Glastonbury (5)

I believe the answer is:

aston

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'villa site' is the definition.
The definition suggests a singular noun which matches the answer.

'in glastonbury' is the wordplay.
'in' indicates a hidden word.
'ASTON' is hidden within 'glastonbury'.

Can you help me to learn more?

(Other definitions for aston that I've seen before include "district of Birmingham" , "and 20: Midlands football club" , "part of Birmingham" , "Area of Birmingham" , "- Villa, football club" .)

I've seen this clue in the Evening Standard.

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