Crossword Genius

Auditory canal buildup (6)

Ross

I believe the answer is:

earwax

(Other definitions for earwax that I've seen before include "Substance accumulating in the lugholes" , "Shell-like secretion" , "Potentially deafening build-up" , "Otic deposit" , "Secretion that can impair hearing" .)

I've seen this clue in the King Feature Syndicate.
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