Equine shelter (6)

I believe the answer is:
stable
'equine shelter' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stable that I've seen before include "Unchanging (condition); some racehorses" , "Fixed; stud building" , "Firmly balanced or fixed" , "Maintaining equilibrium" , "Firmly established" .)