Crossword Genius

Goopy buildup (4)

Ross

I believe the answer is:

gunk

(Other definitions for gunk that I've seen before include "Slimy, oily or dirty substance" , "Unpleasantly messy substance (informal)" , "Unpleasant sticky stuff" , "Unpleasantly sticky stuff" , "Unpleasantly sticky substance" .)

I've seen this clue in the LA Times.
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