Member of a governing body (7)
I believe the answer is:
senator
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">member of a governing body</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for senator that I've seen before include "Member of upper house of legislature" , "Member of upper house commits treason?" , "Treason by member of parliament" , "Member of Upper House engaged in treason" , "Upper house US Congressman" .)