Related Clues:

• Press, as a doorbell
• Shape of a benzene molecule
• 57-Down, for one
• Annulus
• Part of a wedding ceremony
• Phone call
• U2, for one
• One of three, at a circus
• Tour group?
• Toll, as a bell
• Circus or wedding staple
• Symbol of a commitment
• Word after string or rubber
• Go canvassing, say
• Decoding item