Crossword Genius

Engine buildup (5)

Ross

I believe the answer is:

grime

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

This is all the clue.

(Other definitions for grime that I've seen before include "Filth, dirt" , "Engrained dirt" , "Ingrained dirt" , "Muck" , "Dirt, grease" .)

I've seen this clue in The Wall Street Journal.
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