Evergreen character on the radio (3)
I believe the answer is:
yew
'evergreen' is the definition.
(I've seen this before)
'character on the radio' is the wordplay.
'character' becomes 'u'.
'on the radio' shows a homophone (sound like).
'u' sounds like 'YEW'.
(Other definitions for yew that I've seen before include "Evergreen tree with dark leaves and red berries" , "Leaving body" , "This tree grows in churchyard" , "Conifer" , "Tree associated with graveyards" .)