Cad, bounder (5)
I believe the answer is:
rogue
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">cad</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >'<span class="explanation-format__original">bounder</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for rogue that I've seen before include "Dishonest chap; solitary (elephant)" , "Charlatan" , "Diverging from type" , "Bad guy" , "Diseased plant" .)