| NEMO | Captain whose vessel is first believed to be a sea monster |
| WASSAIL | Seasonal entertainment used to be a sea voyage |
| ANDROMEDA | Princess in Greek mythology chained to a rock as a sacrifice to a sea monster and saved from death by Perseus |
| HERSCHEL | German-born British astronomer whose discovery of what he believed to be a comet, which he named after George III, was later identified as a planet and renamed Uranus (8) |
| NESS | Loch where a sea monster is said to live |
| SCYLLA | In Greek mythology a sea nymph transformed into a sea monster (6) |
| CETE | A sea monster; a whale; or, from "assembly", a company of badgers (4) |
| STJOHNSWORT | Flowering plant in the family Hypericaceae believed to be a natural antidepressant (2,5,4) |
| MATTHEW | Apostle believed to be a tax collector |
| SEAHOLLY | The coastal plant Eryngium maritimum, believed to be a strong aphrodisiac in Elizabethan England |
| ANGEL | Spiritual being believed to be a messenger of God (5) |
| FIB | Part of rebuff I believed to be a harmless lie (3) |
| UMBEL | Chrysanthemum believed to be a bit parsley like (5) |
| STORMPETREL | Small seabird formerly believed to be a harbinger of bad weather (5,6) |
| LEVIATHAN | Valiant? He is prepared for a sea monster |
| EXORCISM | Evil spirit chaser to have life around a sea-monster (8) |
| KIDD | Pirate captain whose treasure was thought to be buried on Oak Island |
| WENTWORTH | The captain whose suit Persuasion's protagonist is once convinced to refuse (9) |
| AHAB | Literary captain whose name is a byword for obsession |
| KIRK | Captain whose "future birthplace" is commemorated on a sign in Riverside, Iowa |
