Crossword Genius

Sidewalk art medium (5)

Ross

I believe the answer is:

chalk

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

I've seen this clue in The Washington Post Sunday and the USA Today.
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