Related Clues:

• A couple of ducks
• Dreaded double
• The accepted level is about one or two
• Brace, or how braces come
• Sound of French pop duo
• Twins
• One plus one
• Duet's quiet song
• What's three, four, or five, divided by one or two?
• Skating competition entry, maybe
• 10-10 or Q-Q
• Nonpolygamous grouping
• Poker opener, perhaps
• Three-of-a-kind beats it
• One couple