Possible Clues:

• Martial art created by Morihei Ueshiba
• A Japanese martial art using locks and pressure against joints
• Locks and pressure against joints are used in this Japanese martial art
• Martial art meaning "the way of harmonious spirit"
• Martial art meaning 'the way of harmonious spirit'
• Japanese martial art similar to judo
• Janitor regularly assumes leather for self-protection
• Combative sport in a ring enthralling one child
• Self-defense study
• Japanese martial art similar to judo