Crossword Genius

... in case lice affected political assembly in ancient Greece (8)

Ross

I believe the answer is:

ecclesia

I'm a little stuck... Click here to teach me more about this clue!

'ancient greece' is the definition.
The definition suggests a singular noun which matches the answer.

'in case lice affected political assembly' is the wordplay.
'case lice' anagrams to 'ECCLESIA'.
But, I am not clear how this is indicated.

'in' is the link.

Can you help me to learn more?

(Another definition for ecclesia that I've seen is " Church congregation".)

I've seen this clue in the Sydney Morning Herald.
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