Crossword Genius

Grease, e.g. (9)

Ross

I believe the answer is:

lubricant

(Other definitions for lubricant that I've seen before include "it has a smoothing effect" , "Oil, for example" , "Eg, grease" , "Substance reducing friction" , "What might have you well oiled" .)

I've seen this clue in The Sun.
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