Groom at inn (6)
I believe the answer is:
ostler
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">groom at inn</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ostler that I've seen before include "Horse man" , "ER lost (anag) - former stableman" , "He held the horse at the old inn" , "Horseman at the inn of old" , "Horse minder" .)