Crossword Genius

Cause friction

Ross

I believe the answer is:

'cause friction' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for rub that I've seen before include "Move over something with pressure" , "Abrade" , "Work in" , "There's the . . ., a difficulty or impediment" , "Apply friction to - difficulty" .)

I've seen this clue in the Evening Standard.
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