Related Clues:

• Single
• Music for two
• See 1-Across
• Twosome
• Whist variety
• Piece for two
• See 47-Across
• Aeronautics achievement
• Aria, usually
• Piano-violin piece
• Puccini's 'Flower ___'
• Single-handed
• Fly like Lindy
• Stag
• See 23-Across