| TREELINE | The edge of a habitat beyond which, due to cold, altitude, aridity, exposure to wind or other cause, |
| EROSIVN | Describing water, wind or other natural agents that tend to wear away land or rocks (7) |
| EROSIVE | Describing water, wind or other natural agents that tend to wear away land or rocks (7) |
| WEATHERBEATEN | Damaged by exposure to wind and rain (7-6) |
| INDICATOR | A blinker; or, a species, such as the Adonis blue, barn owl, English bluebell, oakmoss or turtledove, whose absence, abundance or presence reflects a specific environmental condition in a habitat (9) |
| WILDING | Restoring a habitat to a more natural state, as a gardener might do on a small scale (7) |
| AGGRO | A horse, say, or other cause of trouble (5) |
| CRUSADE | A vigorous and dedicated campaign or movement for religious or other cause |
| BIOTOPE | Subdivision of a habitat, often small, associated with a particular ecological community (7) |
| HEDGE | Word linking with row to make a habitat forming part of the countryside (5) |
| GOOSEBUMPS | Small bumps that appear on the skin due to cold, fear or excitement (10) |
| NEOPHYTE | Term for a plant recently introduced to a habitat or region (8) |
| ARID | Of a habitat, dry, desert-like (4) |
| NOLINA | Covering around one-third of the UK's terrain, a habitat often with blanket bog (6) |
| TAKESIDES | Support one or other cause (4,5) |
| CHILBLAIN | Inflammation of the extremities due to cold (9) |
| NYMPHS | Mythical Greek spirits envisaged as beautiful maidens inhabiting or ruling the clouds, conifers, crystals, doves, flowers, groves, honey, laurel, rivers, snow, stars, trees, winds or other natural phe |
| SOIL | To wind or twist into spirals or rings |
| ERODE | Wear away due to wind or water |
| KELP | Growing in underwater forests and absorbing carbon, a seaweed whose holdfast provides a habitat for seahorses, sea stars, jellyfish, anemones and other marine life (4) |
