| MASTER | Captain of a merchant ship |
| MASTERMARINER | A sailor qualified to act as captain of a merchant ship (6,7) |
| TONNAGE | The weight of the cargo of a merchant ship (7) |
| ABLESEAMEN | Naval rating of the deck department of a merchant ship (4,6) |
| SEACAPTAIN | Commander of a merchant ship (3,7) |
| WINDJAMMER | Snake, a cause of blockage in a merchant ship? |
| SEATRADE | Industry of a merchant marine |
| FIRSTMATE | Second in command of a merchant vessel (5,4) |
| SUPERCARGO | Representative of the ship's owner on a merchant ship responsible for the goods being carried |
| ABLE | The 'A' in the 'AB' rating given to a sailor on a merchant ship (4) |
| KEELAGE | Toll on a merchant ship entering a port |
| TRADER | Generic term for a person who buys/ sells stocks, shares, currency, bonds; or, another word for a merchant ship (6) |
| BOSUN | A surprise bonus for the petty officer on a merchant ship (5) |
| SECONDMATE | A deputy to the first officer on a merchant ship (6,4) |
| FOCSLE | Crew's living quarters on a merchant ship |
| REDENSIGN | Communist officer seen on a merchant ship (3,6) |
| TRAMP | Vagrant on a merchant ship (5) |
| LONGBOAT | Item aboard a merchant ship |
| STEAMER | Moored in Trieste, a merchant ship (7) |
| MATE | Junior officer on a merchant ship |
