Related Clues:

• Pinch-hit
• Enter, as a room
• Try to mediate, perhaps
• Get involved
• Share
• Do more than mediate
• Get involved with someone else's business
• Get in on the action
• Participate
• Shoe without laces, e.g.
• Join in the fun
• Join in, but help yourself only to some of it
• Interfere with Ulster pets back there
• Intervene dramatically, or at a senior level
• Do more than listen