Crossword Genius

Impromptus, primarily from Alexander Scriabin, including early pieces from Debussy, Liszt, Ibert and Bartok (2-4)

Ross

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'impromptus primarily from alexander scriabin including early' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.

'pieces from debussy liszt ibert and bartok' is the wordplay.
I cannot quite see how this works, but
'pieces' could be 'ora' (os is a kind of piece) and 'ora' is found within the answer.
This may be the basis of clue (or it may be nonsense).

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I've seen this clue in The Telegraph.
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