Quite violent equestrian events in which Oscar comes last (4,2)
I believe the answer is:
just so
'quite' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for just so that I've seen before include "In a precise manner" , "put together very precisely" , "Precisely, exactly thus" , "Exactly right" , "Carefully planned" .)