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Conservative produced a torrent of wind on radio (4)

Ross

I believe the answer is:

blue

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'conservative' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for blue that I've seen before include "Oxbridge sports award" , "Morose; colour" , "Sunny sky or low spirits" , "despondent" , "e.g. Indigo" .)

I've seen this clue in The Independent.
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