Repetitive ascending extract from twelve-tone nocturne (3-4)

I believe the answer is:

one-note

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'repetitive' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'ascending extract from twelve-tone nocturne' is the wordplay.
'ascending' is a reversal indicator.
'extract from' indicates the answer is hidden within the clue (some letters extracted from the clue).
'etoneno' is hidden within 'twelve tone nocturne'.
'etoneno' reversed gives 'ONE-NOTE'.

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