Swaggering (5)
I believe the answer is:
cocky
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swaggering</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for cocky that I've seen before include "Remove errors from (program)" , "Boldly conceited" , "Cheekily conceited" , "Boldly self-confident" , "Cheeky and self-confident" .)