Song for that man on the radio (4)
I believe the answer is:
Here is my best explanation:
'song' is the definition.
(I've seen this before)
'that man on the radio' is the subsidiary indication.
'that man' becomes 'him' (I've seen this before).
'on the radio' indicates a 'sounds like' (homophone) clue.
'him' is a homophone of 'hymn'.
'for' is the link.
(Other definitions for hymn that I've seen before include "Church song", "Anthem", "Song in praise of 22 down", "Religious song of praise", "Song sung in church", "A song of praise to God", "Psalm", "Song of worship", "Sacred song of praise" and "Orison".)