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Part of church service starting school day? (5,6)

Ross

I believe the answer is:

first lesson

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

'church service starting school day?' is the definition.
I don't know anything about this answer so I cannot tell whether this works.

'part' is the wordplay.
I cannot quite see how this works, but
'part' could be 'so' (so is a kind of part) and 'so' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'of' acts as a link.

Can you help me to learn more?

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