Arrange time for exhibition of horsemanship (8)
I believe the answer is:
'exhibition of horsemanship' is the definition.
'dressage' can be an answer for 'horsemanship' (I've seen this in another clue). I am not certain of the 'exhibition of' bit.
'arrange time' is the wordplay.
'arrange' becomes 'dress' (synonyms).
'time' becomes 'age' (an age is a period of time).
'for' acts as a link.
Can you help me to learn more?
(Other definitions for dressage that I've seen before include "Method of horse training" , "Equestrian discipline" , "Manoeuvres of a horse in response to body signals by its rider" , "Art of horse training" , "Part of equestrian event" .)