Monarch's seat (6)
I believe the answer is:
throne
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">monarch's seat</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 throne that I've seen before include "Seat of authority" , "Ceremonial seat" , "Regal seat" , "A king or queen sits on it" , "Sovereign's chair" .)