Litigated
I believe the answer is:
sued
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">litigated</span>' is the definition.<br/ ><span class="explanation-format__explanation">('sue' can be a synonym of 'litigate')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sued that I've seen before include "Started legal proceedings against (someone)" , "Took legal action against" , "Brought an action against" , "taken to court" , "Prosecuted" .)