A cloud, especially a raincloud, or the storm that comes from it (6)

I believe the answer is:

nimbus

(Other definitions for nimbus that I've seen before include "Dirty cloud; saintly light" , "it could bring rain" , "Is numb (anag)" , "One may be seeded" , "A kind of rain-cloud, or 15 Across" .)

I've seen this clue in The Times.

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