Related Clues:
- Service bonus
- Game with Miss Scarlet and Professor Plum
- Bit of help
- Part of an iceberg that's visible
- Helpful suggestion
- Wait for it
- Fingerprints, e.g.
- Leave cash
- Holmes quest
- Pointed extremity
- Criminal game?
- You leave it behind in a restaurant
- Sleuth's aid
- Iceberg feature, figuratively
- Sleuthing aid