Certainly not several times less again! (4,4)

I believe the answer is:

once more

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This clue might be a double definition.

'certainly not several times less' is the first definition.
Both the answer and definition are adverbs. Maybe you can see a link between them that I don't see?

'again' is the second definition.
(synonyms)

Can you help me to learn more?

(Another definition for once more that I've seen is " Again".)

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