Corsair (6)
I believe the answer is:
pirate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">corsair</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 pirate that I've seen before include "Rover" , "Illegally-copied (version)" , "Criminal on the high seas" , "Copyright infringer" , "Penzance marauder ?" .)