Broadcasts matches after power is lost (4)
I believe the answer is:
airs
'broadcasts' is the definition.
('air' can be a synonym of 'broadcast')
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for airs that I've seen before include "Broadcasts" , "affected demeanour" , "Tunes and posturings" , "Pretentiousness" , "Tunes and affectations" .)