Croon etc playing classical piece (8)
I believe the answer is:
concerto
'classical piece' is the definition.
'concerto' can be an answer for 'piece' (I have seen 'Orchestral piece' mean 'concerto' so perhaps 'piece' could also mean 'concerto'). I'm not certain of the 'classical' bit.
'croon etc playing' is the wordplay.
'playing' is an anagram indicator.
'croon'+'etc'='croonetc'
'croonetc' is an anagram of 'CONCERTO'.
Can you help me to learn more?
(Other definitions for concerto that I've seen before include "Musical work" , "10 [COMPOSITION]" , "Work for soloist and orchestra" , "Work for orchestra and soloist(s)" , "piece of music" .)