Describing one whos mounted but unsaddled (8)
I believe the answer is:
bareback
'unsaddled' is the definition.
(similar in meaning)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for bareback that I've seen before include "On an unsaddled horse" , "kind of riding" , "On a horse without a saddle" .)