| Clue | Source | Date |
|---|---|---|
| Reference in a film that might be hard to notice on first watch | ||
| Wily affirmative gesture | ||
| Surreptitious assent | LA Times Daily | 28 Jun 2024 |
| Surreptitious gesture with the head | New York Times | 29 May 2023 |
| Subtle signal that might accompany a wink | New York Times | 30 Aug 2022 |