Monarch's adviser (8)
I believe the answer is:
courtier
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">monarch's adviser</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 courtier that I've seen before include "Messenger" , "Royal attendant" , "Sovereign's attendant" , "Monarch's adviser" , "Royal adviser" .)