Sea rover (6)
I believe the answer is:
pirate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sea rover</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that sea rover can be written as pirate)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pirate that I've seen before include "Rover" , "Use (another's work) for profit without permission" , "Illegal" , "Copyright infringer" , "Copy published material illegally" .)