Ancient letters (5)
I believe the answer is:
runes
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">ancient letters</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for runes that I've seen before include "Small stones bearing symbols with magic significance" , "Mysterious letters" , "Old letters" , "marks on old tablets" , "old characters" .)