Like a show jumper's career? (8)
I believe the answer is:
eventful
'like' is the definition.
Both the answer and definition are adjectives. Maybe you can see an association between them that I don't see?
'a show jumper's career?' is the wordplay.
'a show' becomes 'event' (event can mean a show or exhibition).
'jumper's career?' becomes 'ful' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'event'+'ful'='EVENTFUL'
Can you help me to learn more?
(Other definitions for eventful that I've seen before include "Action-packed" , "Packed with incident, lively" , "Packed with action, lots happening" , "Full of incidents, momentous" , "Lively and exciting" .)