| BARNACLE | Crustacean once thought to be the origin of certain geese |
| FRONT | In cold or warm weather, certain geese have a white one (5) |
| GANDERS | Certain geese |
| DEMIJOHN | French dame-jeanne is thought to be the origin of the name of what large bulbous bottle? (8) |
| ATHENS | In legend, a messenger ran about 40km from the town of Marathon to where, the feat said to be the origin of the marathon running event? (6) |
| DITHYRAMB | Passionate choral hymn sung in honour of the god Dionysus, considered by Aristotle to be the origin of Greek tragedy (9) |
| BIGBANG | Hypothetical explosion some believe to be the origin of the universe (3,4) |
| VESPUCCI | Italian navigator whose forename is said to be the origin of "America" |
| ARCHAEOPTERYX | The genus of feathered dinosaur that was once thought to be the oldest known fossil bird. Fossils are known from specimens found in the Solnhofen Limestone Formation in Bavaria, Germany, starting in 1 |
| INSPIRE | Fill with confidence - be the origin of (7) |
| SPLEEN | Malice was once thought to be the seat of melancholy (6) |
| ATOM | It was once thought to be the smallest particle of matter |
| EGYPTIAN | "Gypsy" comes from what word, once thought to be the race of all gypsies? (8) |
| GREATWALLOFCHINA | Barrier once thought to be the only man-made object visible from the Moon (5.4.2.5) |
| NANDADEVI | Indian mountain once thought to be the world’s highest |
| MELROSE | ___ Abbey in the Scottish Borders, thought to be the burial location of the heart of Robert the Bruce (7) |
| 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) |
| FALLENSTAR | A gelatinous mass of cyanobacteria once thought to be of meteoric origin (6,4) |
| ARDEN | Old Warwickshire forest once thought to be the setting for As You Like It (5) |
| PILTDOWN | ___ Man, hoax skull once thought to be the missing link between apes and humans (8) |
