| Clue | Source | Date |
|---|---|---|
| Concept of many candelas? Brainwave! (6,4) | ||
| Flash of inspiration | Wall Street Journal | 29 Jul 2024 |
| Plan that came to you when lit up? | ||
| Stroke of genius … or the theme of this puzzle | New York Times | 30 Oct 2023 |
| Flash of genius | New York Times | 31 May 2021 |
| Notion that leads to a solution | Newsday | 17 Jul 2018 |
| Promising proposal | ||
| Start of an invention | ||
| Absurd notion, facetiously | ||
| Inventive thought | ||
| Clever solution | ||
| Absurd notion, facetiously |