Twit (5)
I believe the answer is:
idiot
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">twit</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for idiot that I've seen before include "Ass, nincompoop" , "one needing head examined?" , "Moron, fool" , "Dipstick" , "nutter" .)