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On paper, perhaps, the hard stuff (5)


I believe the answer is:


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This could be a double definition.

'on paper' is the first definition.
'emery' can be an answer for 'paper' (I have seen 'Abrasive paper ' mean 'emery' so perhaps 'paper' could also mean 'emery'). I am not sure about the 'on' bit.

'the hard stuff' is the second definition.
(I've seen this before)

'perhaps' acts as a link.

Can you help me to learn more?

(Other definitions for emery that I've seen before include "Abrasive form of corundum" , "Abrasive powder" , "Coating on paper used as an abrasive" , "hard stuff" , "Hard grey-black mineral used as an abrasive" .)

I've seen this clue in the Evening Standard.
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