Miss start of couple broadcasting (6)
I believe the answer is:
airing
'broadcasting' is the definition.
('air' can be a synonym of 'broadcast')
'miss start of couple' is the wordplay.
'miss start of' means to remove the first letter (I've seen 'missing start of' mean this).
'couple' becomes 'pairing' (I've seen this before).
'pairing' with its initial letter taken away is 'AIRING'.
(Other definitions for airing that I've seen before include "Ventilation" , "Expressing (an opinion) publicly" , "Ventilating, say a grievance" , "Showing" , "Expressing (a grievance) publicly" .)