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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Potters' materials:

FRIT: Potters' material
CLAYS: Potters' materials
CLAY: Potter's material associated with the end of 17-, 27-, 49- and 64-Across
CLAYPIT: Source for a potter's material
CLAY: Potter's material
SOIL: Potter's material
ELM: Wand material in the Harry Potter books
YEW: Material for Voldemort's wand, in Harry Potter books