Steed or stallion (5)
I believe the answer is:
horse
I believe this is a double definition.
'steed' is the first definition.
(I've seen this in another clue)
'stallion' is the second definition.
(I've seen this before)
(Other definitions for horse that I've seen before include "runner" , "gym apparatus" , "Ridden animal" , "Equid" , "Vaulting block" .)