Royal residence (6)
I believe the answer is:
palace
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">royal residence</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 palace that I've seen before include "imposing building" , "Splendid house" , "Royal mansion" , "Large building" , "Castle" .)