Something quotable from champ appearing on channel (5,4)
I believe the answer is:
sound bite
'something quotable' is the definition.
'champ appearing on channel' is the wordplay.
'champ appearing' becomes 'bite' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'on' is a charade indicator (letters next to each other).
'channel' becomes 'sound' ('sound' can be a synonym of 'channel').
'bite' after 'sound' is 'SOUND BITE'.
'from' is the link.
(Other definitions for sound bite that I've seen before include "Short excerpt" , "Pithy extract from something said" , "Grab" , "Succinct extract from a speech or interview" , "Brief extract from interview/speech" .)