People in the services (12)

I believe the answer is:

congregation

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'people in' is the definition.
'congregation' can be an answer for 'people' (thesaurus). I'm unsure of the 'in' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for congregation that I've seen before include "Group of worshippers" , "Group assembling for worship" .)

I've seen this clue in The Guardian and The Globe and Mail.

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