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

'impromptus' is the definition.
(I know this)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

'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).

Can you help me to learn more?

'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).

Can you help me to learn more?