Crossword Genius

Substance that reduces friction (9)

Ross

I believe the answer is:

lubricant

(Other definitions for lubricant that I've seen before include "E.g. oil" , "it has a smoothing effect" , "What might have you well oiled" , "Substance used to reduce friction" , "Substance reducing friction" .)

I've seen this clue in the Sydney Morning Herald.
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