Crossword Genius

Old town hall snoop, one previously in corporation (9)

Ross

I believe the answer is:

prytaneum

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This might be a double definition.

'old town hall snoop' is the first definition.
I can't judge whether this definition defines the answer.

'one previously in corporation' is the second definition.
The definition suggests a singular noun which matches the answer.

Can you help me to learn more?

(Another definition for prytaneum that I've seen is " ancient town hall".)

I've seen this clue in The Times and The Sunday Times.
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