Stableman at an inn (6)
I believe the answer is:
ostler
'stableman at an inn' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for ostler that I've seen before include "Nags for me" , "Groom, stableman" , "Inn servant" , "Horse attendant" , "Attendant for horses in olden times" .)