Crossword Genius

Protest loudly at the storm noise (7)

Ross

I believe the answer is:

thunder

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

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

Can you help me to learn more?

(Other definitions for thunder that I've seen before include "Big noise" , "Atmospheric booms" , "Speak in booming voice" , "Storm noise" , "Hurt Ned (anag) - loud noise" .)

I've seen this clue in The Mirror.
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