Old characters synonymous with The Script made a lasting impression on The Stones (5)

I believe the answer is:

ogham

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'old characters' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

(Other definitions for ogham that I've seen before include "Old British characters" , "Old form of writing" , "Old Celtic alphabet" , "Celtic characters" , "character forming" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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