Crossword Genius

- stone, artefact that was the key to deciphering Egyptian hieroglyphics (7)

Ross

I believe the answer is:

rosetta

(Other definitions for rosetta that I've seen before include "Famous stone's from here" , "Whence Champollion's stone" , "Inscribed basalt slab (found 1799), key to deciphering Egyptian hieroglyphs" , "Source of revelatory stone" , "Town in Egypt where famous stone was found" .)

I've seen this clue in The Times.
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