No-good guy
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">no-good guy</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 louse that I've seen before include "Wingless bloodsucker" , "Bloodsucking parasitic insect" , "scum" , "Wingless bloodsucking insect" , "Wingless parasite" .)