Assemble notes for broadcast (5)
I believe the answer is:
raise
'assemble' is the definition.
(I've seen this in another clue)
'notes for broadcast' is the wordplay.
'notes' becomes 'res' (more than one re, a musical note).
'for broadcast' indicates a 'sounds like' (homophone) clue.
'res' sounds like 'RAISE'.
(Other definitions for raise that I've seen before include "Exalt" , "rally" , "jack up" , "Erect; grow" , "Increase; elevate" .)