Group boycotted on the radio (4)
I believe the answer is:
band
'group' is the definition.
(band can mean a group of people)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for band that I've seen before include "Pop group; stripe" , "troop" , "Loop; rock group" , "Orchestra" , "Musicians - gang" .)