Show with Brontë heroine on the radio (3)
I believe the answer is:
air
'show' is the definition.
(both can mean broadcast)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for air that I've seen before include "Mixture of gases required for breathing" , "Mix of gases surrounding the earth" , "Ventilate with breathing gas" , "Divulge" , "Region above the ground" .)