Officer's personal servant (6)
I believe the answer is:
batman
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">officer's personal servant</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 batman that I've seen before include "Comic strip character" , "Caped crusader of Gotham City, cartoon or cinema" , "Superhero, Robin's partner" , "Caped superhero" , "Comic book hero with Robin as a sidekick" .)