| YGGDRASIL | In Norse mythology, the ash tree that was thought to overshadow the world, binding together earth, heaven and hell with its roots and branches |
| ASPHODEL | A plant of the lily family that was thought to carpet Hades in Greek mythology (8) |
| OPAL | Lustrous gem that was thought to bring good luck in the Middle Ages |
| CEMENTATION | The binding together by strong bonds |
| SEASONED | Experienced steeds regularly binding together (8) |
| YGDRASIL | In Norse mythology, the ash tree binding heaven, earth and hell (8) |
| OAK | According to tradition, what tree was associated with the god of thunder because it was thought to be the tree most likely to be hit by lightning? (3) |
| INNERTEMPLE | Which of the Inns of Court was thought to have begun in the 13th century when it housed the lawyers who advised the Knights Templar? (5,6) |
| YEW | Tree that was the source of the poison in Christie's A Pocket Full of Rye |
| PEA | Miniature cork ball in a whistle; old name for a bird in the genus Pavo known collectively as a muster; or, a podded vegetable whose original name was thought to be plural (3) |
| ROCKYV | 1990 Stallone boxing film which at the time was thought to be the conclusion of its series |
| EMERALD | In ancient times, what gemstone was thought to cure diseases of the eye? (7) |
| CIRCE | Mythical sorceress whose name is referred to in the Latin epithet of enchanter's nightshade, for it was thought by botanists to be used by the aforesaid spellbinder to bewitch Odysseus's companions (5 |
| PHOENIX | A bird in the ash tree? (7) |
| FALLINGOFF | A decrease in the fruit of a tree that was shaken? (7,3) |
| FELT | Baize-like fabric whose former "carroting" method of construction was thought to have given rise to the phrase "mad as a hatter" (4) |
| DEVIGENRE | For many years this type of simple polyalphabtic cipher was thought to be impregnable and was known as le chiffre indechiffrable, literally "the unbreakable cipher." |
| BATTLESHIP | Bismarck, for one, was thought invincible in the main, only to go down in war like many another! (10) |
| OAKLEAF | Depicted on the National Trust logo, part of an acorn-bearing tree that was used to form a Roman civic crown (7) |
| SALEMRIVER | NICK WAS THOUGHT TO HAVE DROWNED IN IT (DAYS, two words) |
