Notes on scriptures used in Christmas oratorio (6)

I believe the answer is:

masora

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'notes on scriptures used' is the definition.
I can't tell whether this defines the answer.

'in christmas oratorio' is the wordplay.
'in' indicates the answer is hidden within the clue.
'MASORA' can be found hidden inside 'christmas oratorio'.

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I've seen this clue in The Times.

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