Broadcast includes piano encore (6)
I believe the answer is:
replay
'encore' is the definition.
(thesaurus)
'broadcast includes piano' is the wordplay.
'broadcast' becomes 'relay' (I've seen this before).
'includes' is an insertion indicator.
'piano' becomes 'p'.
'relay' going around 'p' is 'REPLAY'.
(Other definitions for replay that I've seen before include "Repeat recording of part of game" , "kind of race" , "second game" , "Repeat fixture" , "Hold match again" .)