Segment on the radio, still (5)
I believe the answer is:
peace
'still' is the definition.
(I've seen this before)
'segment on the radio' is the wordplay.
'segment' becomes 'piece' (I've seen this in another clue).
'on the radio' shows a homophone (sound like).
'piece' is a homophone of 'PEACE'.
(Other definitions for peace that I've seen before include "A Christmas wish" , "Calm, tranquility" , "Absence of conflict" , "Caught" , "Calmness" .)