Pieces arranged for piano recitals (9)
I believe the answer is:
particles
'pieces arranged for' is the definition.
'particles' can be an answer for 'pieces' (I have seen 'Tiny pieces ' mean 'particles' so perhaps 'pieces' could also mean 'particles'). I'm not sure about the 'arranged for' bit.
'piano recitals' is the wordplay.
I cannot really see how this works, but
'piano' could be 'p' (musical abbreviation) and 'p' is found within the answer.
an anagram of 'recitals' is 'articles' which is within the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for particles that I've seen before include "Scraps" , "Minute pieces of matter" , "Tiny pieces" .)