Inn for travellers — it accommodates horse (6)
I believe the answer is:
imaret
'inn for travellers' is the definition.
(historical type of inn in Turkey)
'it accommodates horse' is the wordplay.
'accommodates' means one lot of letters goes inside another.
'horse' becomes 'mare' (mare is a kind of horse).
'it' enclosing 'mare' is 'IMARET'.
(Other definitions for imaret that I've seen before include "Turkish inn" , "Eastern inn" .)