One conducting a religious refresher course? (10)

I believe the answer is:

revivalist

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'one conducting a religious refresher course?' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.

This is all the clue.

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(Another definition for revivalist that I've seen is " Preacher".)

I've seen this clue in The Irish Independent.

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