Make lawful (8)
I believe the answer is:
legalise
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">make lawful</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 legalise that I've seen before include "Make licit" , "Make lawful" , "See a gill (anag.)" .)