Officer of the British royal household (7)
I believe the answer is:
equerry
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">officer of the british royal household</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 equerry that I've seen before include "Attendant at court" , "Personal attendant of a member of the royal family" , "Attendant at palace" , "Sovereign's officer" , "Royal aide" .)