Sound disapproving, turning it on everyone playing (5)
I believe the answer is:
tutti
'everyone playing' is the definition.
I can't judge whether this definition defines the answer.
'sound disapproving turning it on' is the wordplay.
'sound disapproving' becomes 'tut' (I've seen this before).
'turning' is a reversal indicator.
'on' means one lot of letters go next to another.
'it' reversed gives 'ti'.
'tut'+'ti'='TUTTI'
Can you help me to learn more?
(Other definitions for tutti that I've seen before include "With all playing together (music)" , "- - -frutti" , "Section for all musicians" , "With all instruments playing at once (music)" , "(Musically) performed by all instruments" .)