Crossword Genius

Writing material (5)

Ross

I think it could be either:

paper

chalk

'writing material' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for chalk that I've seen before include "Calcium carbonate" , "Soft white limestone (as distinct from cheese)" , "Opposite of cheese?" , "Blackboard writing implement" , "Substance totally different from cheese!" .)

I've seen this clue in The Mirror, The Daily Mail and the Evening Standard.
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