Crossword Genius

Fun for horsy set Friday through Sunday? (5-3,5)

Ross

I believe the answer is:

three-day event

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'fun for horsy set' is the definition.
(type of equestrian event)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for three-day event that I've seen before include "Equestrian competition involving several skills" , "Equestrian competition comprising several disciplines" , "Horse-riding competition" , "Dressage, cross-country and showjumping" .)

I've seen this clue in The Times.
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