Related Clues:
- Service award?
- Some extra bills, maybe
- It's gratuitous?
- Iceberg extremity
- Thank you for waiting
- Fifteen percent, often
- It may be left on a table
- Recognition of good service
- With 48-Across, leader of the House of Representatives, 1977-87
- 15 percent of a bill, perhaps
- Topple over — hint
- Restaurant calculation
- End — pourboire
- Thank you for waiting to get some advice
- Stockbroker's offering