| NAUTILI | Cook tuna, one followed by 51 other sea creatures (7) |
| ITALIC | When I act, 51 others must be there, too I'm that type (6) |
| NAUTICAL | Ocean-going wild tuna one caught on a line (8) |
| ALEUTIAN | Beer served with tuna one ordered in these islands? |
| ASTRONAUT | Dishing out roast tuna - one that's out of this world |
| CATFISH | Tiger shark? Some other sea creature |
| MILLION | Number represented as one followed by six zeros (7) |
| BILLION | One followed by nine noughts (7) |
| PORTICO | Set of columns in harbour, one followed by company (7) |
| ASININE | Absurd as one followed by several more (7) |
| NOISOME | Very unpleasant number, one followed by two notes (7) |
| CLIENTS | Pennies split by 51 customers (7) |
| BLUBBER | The fat of whales and other sea animals (7) |
| STRIVEN | "Other sea-cities have faltered and ___...": Doolittle |
| TRACKED | Having lines that one followed (7) |
| ABALONES | Sailors catching sole and other sea-creatures (8) |
| OCTOPODS | Some days, groups of whales will follow round other sea creatures |
| MUSSEL | "Clappy-doo" with a mother-of-pearl-lined shell, often found anchored to a rock pool with other sea creatures such as an anemone, limpet, periwinkle or starfish (6) |
| CLAM | Crab loves all meal starters for other sea creature |
| ASCIDIAN | From "wineskin, leather bag", a zoological term for a sea grape, sea peach, sea tulip or other sea squirt, characterised by its outer "tunic" and ejection of water (8) |
