Related Clues:

• Hardly a party person
• Troglodyte
• Nonsocial type
• Aloof one
• Solitary soul
• Isolationist
• Hardly an extrovert
• One who avoids others
• Antisocial sort
• Not a company man?
• Soloist?
• 57-Across, e.g.
• No mixer
• Not the gregarious type
• Unsociable sort