Broadcasting a current band (6)
I believe the answer is:
airing
'broadcasting' is the definition.
('air' can be a synonym of 'broadcast')
'a current band' is the wordplay.
'current' becomes 'i' (symbol for electric current).
'band' becomes 'ring' ('ring' can be a synonym of 'band').
'a'+'i'+'ring'='AIRING'
(Other definitions for airing that I've seen before include "Exposure" , "Ventilation" , "Broadcast" , "Showing" , "Broadcasting" .)