On radio, experienced swell style of music (3,4)
I believe the answer is:
new wave
'style of music' is the definition.
I know nothing about this answer so I cannot judge whether this works.
'on radio experienced swell' is the wordplay.
'on radio' indicates a 'sounds like' (homophone) clue.
'experienced' becomes 'knew' (knowing is a kind of experiencing).
'swell' becomes 'wave' (I've seen this in another clue).
'knew' is a homophone of 'new'.
'new'+'wave'='NEW-WAVE'
Can you help me to learn more?
(Other definitions for new wave that I've seen before include "1970s rock style" , "Style of rock music deriving from punk" .)