Related Clues:

• One making markers
• Collection agent's target
• Chit writer
• Deadbeat, e.g.
• One who's in the hole
• One in the red
• One in debt
• Endebted individual
• Credit-card user
• Shy person?
• ---
• One who's shy
• One with a tab
• Debtor, old-style
• Beholden one