Spokesperson's opening snippet (10)
I believe the answer is:
mouthpiece
'spokesperson's' is the definition.
('mouthpiece' can be a synonym of 'spokesperson')
'opening snippet' is the wordplay.
'opening' becomes 'mouth' (mouth is a kind of opening).
'snippet' becomes 'piece'.
'mouth'+'piece'='MOUTHPIECE'
(Other definitions for mouthpiece that I've seen before include "Spokesman" , "Spokesperson" .)