Part of a play recognised on the radio (5)
I believe the answer is:
scene
'part of a play' is the definition.
('scene' is part of 'play')
'recognised on the radio' is the wordplay.
'recognised' becomes 'seen' (I've seen this in another clue).
'on the radio' shows a homophone (sound like).
'seen' is a homophone of 'SCENE'.
(Other definitions for scene that I've seen before include "Subdivision of a drama" , "Subdivision of a play/film" , "Part of a 16" , "Pleasant view or public quarrel" , "Vista or stage setting" .)