Set in stone? (4)

I think it could be either:

Which length description are you looking for?:

etch

'set in stone?' 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 "Make deep lines" , "Use acid to cut design" , "Design by eating out" , "Carve into metal with acid" , "Make designs" .)

I've seen this clue in the Universal.

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