| Clue | Source | Date |
|---|---|---|
| With 18-Down, classic 1967 song by a group whose name is a hint to solving the eight bonus clues | ||
| With 18-Down, classic 1967 song by a group whose name is a hint to solving the eight bonus clues (see note) | New York Times | 13 Jul 2025 |
| 18-Across by the Doors, in two ways | New York Times | 08 Nov 2023 |
| "___ (To the Other Side)" |