Nurse translating letters (5)
I believe the answer is:
runes
'letters' is the definition.
(I have seen 'Old letters ' mean 'runes' so perhaps 'letters' could also mean 'runes')
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for runes that I've seen before include "Old letters" , "Small stones bearing symbols with magic significance" , "Mysterious letters" , "marks on old tablets" , "old characters" .)