Programme on TV that may support the Speaker (7)
I believe the answer is:
soapbox
'that may support the speaker' is the definition.
(a public speaker might stand on a soapbox)
'programme on tv' is the wordplay.
'programme' becomes 'soap' (soap opera is a type of TV programme).
'on' means one lot of letters go next to another.
'tv' becomes 'box'.
'soap'+'box'='SOAPBOX'
(Other definitions for soapbox that I've seen before include "Makeshift orator's stand" , "Platform for public speech-making" , "Platform for airing one's views?" , "Crate used by orators at Speakers' Corner?" , "Primitive rostrum" .)