Sandpaper say difficult to work with? (8)

I believe the answer is:

abrasive

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'sandpaper say' is the definition.
(sandpaper is a kind of abrasive)

I don't understand how the rest of the clue works.

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(Other definitions for abrasive that I've seen before include "Harsh - chafing" , "Rough, irritating" , "One that wears" , "Harsh; eg, emery" , "harsh, rough in manner" .)

I've seen this clue in The Sun.

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