Prescribed by law (9)
I believe the answer is:
statutory
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">prescribed by law</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 statutory that I've seen before include "Of written law as to a trusty" , "Legally prescribed" , "Try-outs at being required by law" , "Relating to written law" , "In accordance with written law" .)