Possible Clues:

• A high jump contest in show-jumping
• Power one observed in catty type leading a new church
• Test of a horse's ability over large obstacles in showjumping
• Rough seas in cup competition with jumps
• Event with obstacles raised up and in cases wrecked
• Power of car, not new, in red
• Tom admits institute switched cane in competition for the horses?
• In show-jumping, test of horse's jumping ability
• Once might test for quality of jumpers