Crossword Genius

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

Ross

There are a few possibilities for this:

I'm a little stuck... Click here to teach me more about this clue!

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for ad-libs that I've seen before include "Improvises" , "Extemporary remarks" , "Extemporaneous remarks" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app