Crossword Genius

Pencil lead material (8)

Ross

I believe the answer is:

graphite

(Other definitions for graphite that I've seen before include "Form of carbon used in pencil leads" , "Black carbon used in lead pencils" , "Mixed with clay it forms the 'lead' in pencils" , "Pencil-lead carbon" , "Pig hater (anag)" .)

I've seen this clue in The Times.
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