Crossword Genius

It's rough and also smoother (9)

Ross

I believe the answer is:

sandpaper

I'm a little stuck... Click here to teach me more about this clue!

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

'it's rough and' is the wordplay.
I cannot quite see how this works, but
'and' could be 'n' (common abbreviation for 'and') and 'n' is found in the answer.
'it' could be 'sa' (old-fashioned abbreviation for sex appeal) and 'sa' is found in the answer.
This may be the basis of the clue (or it may be nonsense).

'also' acts as a link.

Can you help me to learn more?

(Other definitions for sandpaper that I've seen before include "Smooth" , "Abrasive smoother" , "Means of smoothing wood" , "Abrasive substance" , "Spared pan for the stuff used to prepare surfaces" .)

I've seen this clue in The Sun.
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