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 pieces from debussy liszt ibert' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.

'and bartok' is the wordplay.
I cannot really understand how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is present in the answer.
The remaining letters 'eared' is a valid word which might be clued in a way I don't understand.
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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