Crossword Genius

Thick oily substance used as a machine lubricant (6)

Ross

I believe the answer is:

grease

(Other definitions for grease that I've seen before include "Mechanic (informal)" , "Possible cause of slip-up" , "Fatty lubricant" , "Musical animal fat?" , "Lubricate (-ant)" .)

I've seen this clue in The Irish Times.
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