Some cove with a horse (3)
I believe the answer is:
bay
I believe this is a double definition.
'some cove' is the first definition.
(both can mean a coastal inlet)
'horse' is the second definition.
(bay is a kind of horse)
'with a' acts as a link.
(Other definitions for bay that I've seen before include "Part of sea" , "Indentation of a shoreline" , "Chestnut" , "Inlet, cove" , "Howl" .)