"Speaker's Platform", a programme on TV (7)
I believe the answer is:
soapbox
'speaker's platform' is the definition.
'soapbox' can be an answer for 'platform' (soapbox is a kind of platform). I also know that 'speaker' relates to this answer.
'a programme on tv' is the wordplay.
'a programme' becomes 'soap' (**).
'on' is a charade indicator (letters next to each other).
'tv' becomes 'box'.
'soap'+'box'='SOAPBOX'
(Other definitions for soapbox that I've seen before include "Platform for airing one's views?" , "Public speakers may stand on this" , "Rostrum to speak from" , "Primitive rostrum" , "Platform for public speech-making" .)