Possible Clues:

• Equestrian discipline is a habit that comes with time
• Horse training to dip in tangled reeds
• Equestrian discipline is habit coming with time
• Groom ahead of time in equestrian event
• Equestrian training
• Arrange time for a lot of prancing about?
• Ace breaking habit say over equestrian activity
• Tog up to get on in equestrian discipline
• Training of a horse in deportment
• Olympic equestrian competition