Crossword Genius

Is there no credit in wiping it clean? (5)

Ross

I believe the answer is:

slate

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'clean?' is the definition.
The definition and answer can be both to do with contact as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for slate that I've seen before include "Criticise - outdated school equipment" , "Blast" , "Roofing material or credit recorder" , "Grey stone; tab" , "Scold; hard rock" .)

I've seen this clue in the Evening Standard.
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