Abrasive sort of grey coat (5,4)

I believe the answer is:

steel wool

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'abrasive' is the definition.
(steel wool is a kind of abrasive)

'sort of grey coat' is the wordplay.
'sort of grey' becomes 'steel' (I can't explain this - if you can you should give a lot more credence to this answer).
'coat' becomes 'wool' (wool is a kind of coat).
'steel'+'wool'='STEEL WOOL'

Can you help me to learn more?

(Another definition for steel wool that I've seen is " household cleaner".)

I've seen this clue in The Daily Express.

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