| CELANDINE | Yellow wild flower once called pilewort as it was thought to be good for haemorrhoids (9) |
| EYEBRIGHT | Wild flower once used to treat ophthalmic complaints |
| EBONY | Dark wood once used for drinking cups, as it was thought to neutralize poison |
| 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." |
| 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) |
| BUTTERCUP | Yellow wild flower in the genus Ranunculus, held under the chin in a child's game (9) |
| DANDELION | Yellow wild flower |
| YGGDRASIL | In Norse mythology, the ash tree that was thought to overshadow the world |
| PETREL | Storm ___ , seabird so named because it was thought to be a harbinger of rough weather (6) |
| CAMELOPARD | Archaic name for a giraffe, taken from two animals it was thought to resemble (10) |
| 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 |
| 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 |
| KIDD | Pirate captain whose treasure was thought to be buried on Oak Island |
| LADYSBEDSTRAW | Sweet hay- or honey-scented yellow wild bloom of the milk-coagulating genus Galium, fabled to have padded the Virgin Mary's stable crib to soften her ease, it was also strewn as a herb to ward off fle |
| RAGWORT | Yellow wild flower considered a weed due to its toxicity to livestock and horses (7) |
| NEPTUNE | He was thought to be the main controller (7) |
| BEDSTRAW | Lady's -; frothy yellow wild flower with a scent reminiscent of honey or freshly-mown hay that was traditionally dried for stuffing a palliasse (8) |
| FELT | Baize-like fabric whose former "carroting" method of construction was thought to have given rise to the phrase "mad as a hatter" (4) |
| DRINKINGWATER | Having pints is subject to taxation? And, that's supposed to be good for you! (8,5) |
