Chatter always around piano (3)
I believe the answer is:
yap
'chatter' is the definition.
(I've seen this in another clue)
'always around piano' is the wordplay.
'always' becomes 'ay' (archaic term for 'always').
'around' shows that the letters should be reversed in order.
'piano' becomes 'p' (musical abbreviation).
'ay' backwards is 'ya'.
'ya'+'p'='YAP'
(Other definitions for yap that I've seen before include "Gab" , "Pay up for chatter" , "gossip -" , "Pay up for shrill bark (3" , "Talk foolishly" .)