Crossword Genius

Said ... "Firm blows to aural organs produce cerumen!" (6)

Ross

I believe the answer is:

earwax

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'cerumen' is the definition.
(synonyms)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for earwax that I've seen before include "Soft yellow substance secreted by glands of a certain organ" , "Otic secretion" , "Substance accumulating in the lugholes" , "Otic deposit" , "Secretion in the lugholes" .)

I've seen this clue in the Sydney Morning Herald.
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