Crossword Genius

On piano, for example, a minute piece (8)

Ross

I believe the answer is:

particle

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

This could be a double definition.

'on piano for example' is the first definition.
The answer and definition can be both related to communication as well as being singular nouns.
Perhaps there's an association between them I don't understand?

'a minute piece' is the second definition.
(I've seen this before)

Can you help me to learn more?

(Other definitions for particle that I've seen before include "Small piece of matter" , "Tiny piece of anything" , "Minute fragment" , "Crumb" , "Molecule" .)

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