Upper House of parliament (6)
I believe the answer is:
senate
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">upper house of parliament</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 senate that I've seen before include "Upper council of university" , "Governing body of ancient Rome" , "Governors here" , "Legislative body" , "Legislative assembly" .)