Gentleman's gentleman (5)
I believe the answer is:
valet
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gentleman's gentleman</span>' is the definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for valet that I've seen before include "Jeeves?" , "Male servant" , "Personal manservant" , "Man's man" , "Clean (a car); attendant" .)