Where a famous stone was found (7)
I believe the answer is:
rosetta
'where a famous stone was found' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rosetta that I've seen before include "town of old on the Nile" , "Place associated with stone Champollion deciphered" , "The -- Stone is a famous British Museum exhibit" , "The - Stone helped read Egyptian hieroglyphics" , "Inscribed basalt slab (found 1799), key to deciphering Egyptian hieroglyphs" .)