Crossword Genius

Blackboard material

Ross

I believe the answer is:

slate

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

This is all the clue.

(Other definitions for slate that I've seen before include "Run down" , "A roof-tile; criticise heavily" , "Grey stone; tab" , "list of candidates" , "Blast" .)

I've seen this clue in the King Feature Syndicate.
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