The guilty one (7)
I believe the answer is:
culprit
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">the guilty one</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 culprit that I've seen before include "Perpetrator of a wrongdoing" , "he should have conviction" , "The person to blame, the guilty one" , "Wrongdoer" , "The one responsible for a crime" .)