Related Clues:

• One who avoids others
• Not open
• Antisocial sort
• Far from a drama queen
• Not quite enough
• Averse to first moves, e.g.
• Like many a wallflower
• Not a company man?
• Soloist?
• Not outgoing
• Far from bold
• Like wallflowers
• Sudden start
• 57-Across, e.g.
• Not camera-ready?