Crossword Genius

This sharpens good skin's colour (10)

Ross

I believe the answer is:

grindstone

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'this sharpens' is the definition.
The definition suggests a singular noun which matches the answer.

'good skin's colour' is the wordplay.
'good' becomes 'g' (abbreviation).
'skin's' becomes 'rinds' ('rind' can be a synonym of 'skin').
'colour' becomes 'tone' (tone can mean a colour or shade).
'g'+'rinds'+'tone'='GRINDSTONE'

Can you help me to learn more?

(Other definitions for grindstone that I've seen before include "nosing here?" , "Tool sharpener" , "This hones blade" , "Disc for sharpening knives" , "Blade sharpener" .)

I've seen this clue in The Guardian.
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