| TREERING | Mark of natural annual growth |
| TREE | Annual growth markers observable in cross-sections of timber (4,5) |
| RINGS | Annual growth markers observable in cross-sections of timber (4,5) |
| TREERINGCIRCUS | Frenzied activity about an annual growth? |
| PANCREAS | Annual growth margins excluded insulin supplier (8) |
| CHRISTMASTREES | It's all about search terms relating to annual growth (9,5) |
| SUNBOW | Prismatic arc of colours as a result of the refraction of natural light shining through the mist or spray of a waterfall, cascade or fountain (6) |
| NATIONALTRUST | Body concerned with the preservation of areas of natural beauty and buildings of historic significan |
| DARWIN | Charles ?, author of 1859 scientific work On the Origin of Species by Means of Natural Selection (6) |
| WAX | Viscous or solid material of natural origin consisting largely of esters of fatty acids (3) |
| EVOLUTION | From the Latin meaning "unrolling", a process described by Charles Darwin in his theory of natural selection; or, one of a series of military manoeuvres (9) |
| VIEW | Meaning "to see", range of vision; a sight or prospect of natural scenery; or, a work of art depicting this (4) |
| BEEHIVE | It swarms with industry: heaps of natural growth |
| ACCRUE | Superb surroundings for vineyard arise because of natural growth |
| BEARD | Debar change of natural growth on barley maybe |
| NATIVEPLANT | Indigenous growth of natural factory maybe (6,5) |
| JAWS | Awesome parts of a Museum of Natural History display |
| STEROL | Any of a group of natural steroid alcohols (6) |
| EROSION | Process by which the surface of the earth is worn away by the action of natural forces |
| DEFORESTATION | Author filing first of reports on rank destruction of natural resources (13) |
