Dramatic weather (4)

I believe the answer is:

rain

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'weather' is the definition.
(I know that rain is a type of downfall)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for rain that I've seen before include "Fall in large quantities" , "The ---, it ---eth every day (T.Night)" , "Storm" , "See 12" , "Precipitation" .)

I've seen this clue in the Evening Standard.

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