Litigate (3)
I believe the answer is:
sue
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">litigate</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that litigate can be written as sue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for sue that I've seen before include "Little Susan" , "Litigious girl" , "Humbly request" , "Take proceedings against (a person)" , "Bring charges against - girl" .)