Writer Runyon (5)
I believe the answer is:
damon
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">writer runyon</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 damon that I've seen before include "Writer Runyon's first name" , "faithful friend" , "Pythias's friend" , "Matt --, US actor" .)