Knave (5)
I believe the answer is:
rogue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">knave</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that knave can be written as rogue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for rogue that I've seen before include "Scamp" , "Dishonest chap; solitary (elephant)" , "Rapscallion" , "Dishonest man" , "A dishonest or unprincipled person" .)