Legal defence (5)
I believe the answer is:
alibi
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">legal defence</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 alibi that I've seen before include "Defence of being elsewhere at time of crime" , "Claim put to court" , "Court evidence showing one was elsewhere" , "Lawyer's weapon, Latin for 'elsewhere'" , "Legal defence proving innocence" .)