Relevant, to lawyers (2,3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">relevant to lawyers</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ad rem that I've seen before include "pertinent" , "To the point (Latin)" , "Relevant" .)