Conservative produced a torrent of wind on radio (4)
I believe the answer is:
blue
'conservative' is the definition.
(I've seen this before)
I can't explain the remainder of the clue.
Can you help me to learn more?
(Other definitions for blue that I've seen before include "Oxbridge sports award" , "Morose; colour" , "Sunny sky or low spirits" , "despondent" , "e.g. Indigo" .)