Crossword Genius

Canal buildup (6)

Ross

I believe the answer is:

earwax

(Other definitions for earwax that I've seen before include "Potentially deafening build-up" , "Waxy secretion impairing hearing" , "Otic secretion" , "Shell-like secretion" , "Soft yellow substance secreted by glands of a certain organ" .)

I've seen this clue in the LA Times.
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