| Clue | Source | Date |
|---|---|---|
| Secretly planned to put material at bottom of river | The Times Quick Cryptic | 17 Mar 2026 |
| Half of Dundee tartan, say, is secretly made (4-4) | ||
| I pleaded slyly and plotted secretly | ||
| Formed with sagacity, as plans. | ||
| Carefully worked out and kept secret. | ||
| Well-conceived, as a plan. |