The Listener follows programme on before show again (8)
I believe the answer is:
reappear
'show again' is the definition.
(I've seen this before)
'the listener follows programme on before' is the wordplay.
'the listener' becomes 'ear' (body part which hears or listens).
'follows' means one lot of letters go next to another.
'programme' becomes 'app' (type of computer programme).
'on' becomes 're' ('on' can be mean 'with reference to').
'before' says to put letters next to each other.
'ear' put after 'app' is 'appear'.
'appear' put after 're' is 'REAPPEAR'.
(Other definitions for reappear that I've seen before include "Turn up again" , "spring up again?" , "return" , "Show over" , "crop up again" .)