Related Clues:

• Get involved with someone else's business
• Shoe without laces, e.g.
• Intervene dramatically, or at a senior level
• Do more than listen
• Act as a substitute
• Become involved
• Easily donned, as attire
• Enter as a mediator
• Be a substitute
• Start to break up a fight, say
• Intervene to prevent US author suppressing page
• Act as mediator
• What the referee will do to stop a boxer being punished
• Take turn around ends of terrace, and enter
• Shoe with no fastenings