Not the secret service, of course (6,7)
I believe the answer is:
public worship
'service of course' is the definition.
'public worship' can be an answer for 'service' (thesaurus). I'm not certain of the 'of course' bit.
I can't explain the rest of the clue.
Can you help me to learn more?
I've seen this clue in The Irish News.
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