Possible Clues:

• Bone found in shredded RU strip
• Equestrian foot support
• Jockey's foot support
• Agitate about rider’s first piece of tack
• To incite’s about right: rider’s put his foot in it?
• Burst, irruption, using rider’s equipment
• Incite outside right to provide support on the flank
• Bone of the middle ear
• Rider's footrest while on horseback
• Bone crusher ultimately in ferment