Capital music broadcast (5)
I believe the answer is:
seoul
'capital' is the definition.
(capital of South Korea)
'music broadcast' is the wordplay.
'music' becomes 'soul' (type of music).
'broadcast' indicates a 'sounds like' (homophone) clue (how the word might sound on the radio or TV).
'soul' is a homophone of 'SEOUL'.
(Other definitions for seoul that I've seen before include "South Korean capital" , "Olympic venue" , "South Korea capital" , "19 [EASTERN] capital" , "Asian capital" .)