Mount —, volcano and highest mountain in the state of Washington, US (7)

I believe the answer is:

rainier

(Other definitions for rainier that I've seen before include "This is more likely to pour down" , "more cats and dogs?" , "more drops?" , "Prince of Monaco, married to Grace Kelly, d. 2005" , "Former prince of Monaco" .)

I've seen this clue in The Mirror.

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