Write on stone, say (4)
I believe the answer is:
etch
'write on stone say' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for etch that I've seen before include "Engrave; fix firmly" , "Imprint vividly" , "Engrave deeply" , "Draw on metal with acid" , "Carve into surface of something" .)