9 across
Stable
about
to
take
on
one
horse
(8)
Stable about to take on one horse (8)
hints
0
checks
0
hints
The definition is at the end of the clue.
How the clue works
The definition here is horse, referring to a male horse. STALL means "stable", which takes in I for "one", and then ON (meaning "about") is tacked on the end, giving you the answer.