| REDALGAE | A group of algae that have predominantly red pigment (3,5) |
| MOORHEN | British water bird with a predominantly red bill (7) |
| LYCOPENE | A red pigment in tomatoes and many berries that acts as a powerful antioxidant (8) |
| CINNABAR | Chief ore of mercury; source of the brilliant red pigment vermilion (8) |
| SEAWEEDS | Multicellular marine algae that grows on the seashore, in salt marshes, in brackish water, or in the ocean (8) |
| CAROTENE | Rate once disturbed red pigment (8) |
| AGARAGAR | Colloidal extract of algae |
| ALIZARIN | Red pigment |
| TRUFFLES | Fruiting bodies of a subterranean fungus, predominantly one of the many species of the genus tuber (8) |
| NUNCUPAT | He calls by name, he names as heir (a predominantly legal term) |
| ANGLESEY | Predominantly Welsh-speaking region of Wales (8) |
| BLOOM | A flower; a rosy colour; a healthy glow on one's cheeks; a fine powdery coating on chocolate, grapes or plums; or, a rapid seasonal flourish of algae (5) |
| IRISHMOSS | Red algae that grows on the eastern coasts of the North Atlantic (5,4) |
| BASEBALL | Predominantly North American game |
| SUBURBIA | Predominantly residential area |
| DIATOM | Girl with a miniscule constituent of a type of algae |
| KELP | Name for dozens of species of brown algae that grow as large coastal seaweeds in colder seas, providing critical habitat and food for many fish and invertebrates. (4) |
| SEAWEED | Marine algae that makes a nutritious, sustainable fertiliser (7) |
| WEED | Candyfloss-like green algae that can cover a pond (7,4) |
| BLANKET | Candyfloss-like green algae that can cover a pond (7,4) |
