Approaches made by listeners after end of transmission (5)
I believe the answer is:
nears
'approaches' is the definition.
('near' can be a synonym of 'approach')
'listeners after end of transmission' is the wordplay.
'listeners' becomes 'ears' (body parts which listen).
'after' is a charade indicator (letters next to each other).
'end of' suggests the final letters.
The last letter of 'transmission' is 'n'.
'ears' after 'n' is 'NEARS'.
'made by' is the link.
(Other definitions for nears that I've seen before include "Bears down" , "Becomes closer" , "Draws closer to" , "Draws close" , "Gets closer" .)