Excellent left-winger given broadcast (5)
I believe the answer is:
aired
'broadcast' is the definition.
('aired' can be a synonym of 'broadcast')
'excellent left-winger given' is the wordplay.
'excellent' becomes 'ai'.
'left-winger' becomes 'red' (red is a kind of left-winger).
'given' is a charade indicator (letters next to each other).
'ai'+'red'='AIRED'
(Other definitions for aired that I've seen before include "Made public" , "Exposed to breeze for freshening - say damp clothes" , "Ventilated, or hung out to dry" , "Exposed for drying" , "Expressed publicly" .)