Lead in a Pencil
This page is the CodyCross answer for the clue below from Spa Time, Group 813, Puzzle 1 (Sparkling Wine).
Question is: Lead in a Pencil
and the answer is: GRAPHITE
Word Meaning:
GRAPHITE — An allotrope of carbon, consisting of planes of carbon atoms arranged in hexagonal arrays with the planes stacked loosely, that is used as a dry lubricant, in "lead" pencils, and as a moderator in some nuclear reactors.
Definitions from Wiktionary.