Crossword Genius

Cloudy, getting thundering (4)

Ross

I believe the answer is:

loud

I'm a little stuck... Click here to teach me more about this clue!

'thundering' is the definition.
(I've seen this in another clue)

'cloudy' is the wordplay.
'LOUD' is hidden within the letters.
However, I am unsure how the hidden word is indicated.

'getting' acts as a link.

Can you help me to learn more?

(Other definitions for loud that I've seen before include "Brash" , "Audibly, or visually, obtrusive" , "Noisy or garish" , "At high volume" , "Noisily showy?" .)

I've seen this clue in The Mirror.
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