Saint associated with the Russian alphabet (5)
I believe the answer is:
cyril
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">saint associated with the russian alphabet</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cyril that I've seen before include "Saint said to have created the Russian alphabet" , "Reputed saintly inventor of the Russian alphabet" .)