Related Clues:

• Way to attend a party
• Singularly
• Horned animal
• See 21 Across
• Deer fellow
• Certain deer
• Partnerless
• Alone, at a party
• See 19 Across
• Admiral Byrd's book
• Flying solo, e.g.
• "In bad company," according to Bierce
• Beau for a doe
• *With 7-Across, like a couple romancing
• Men-only party