Rub hard (5)

I think it could be either:

scrub

scour

'rub hard' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for scrub that I've seen before include "Cancel (informal)" , "Rub hard to clean" , "Stunted growth" , "Get rid of" , "Cleanse" .)

I've seen this clue in The Mirror, the Penny Press, The Independent and the Evening Standard.

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