Servant's uniform (6)
I believe the answer is:
livery
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">servant's uniform</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for livery that I've seen before include "Horse maintenance" , "Uniform worn by male servants" , "The care of horses for pay" , "old servants" , "Distinctive uniform once worn by servants of posh people" .)