| AEOLIAN | Relating to the action of wind |
| ACTINIC | Relating to the action of UV light |
| ERODE | Wear down, as by the action of wind or water |
| BUFFETING | Violent action of wind or waves |
| OPSONIN | An antibody in blood serum that attaches to invading microorganisms and other antigens to make them more susceptible to the action of phagocytes. |
| COOK | To subject to the action of heat is all right by small business |
| STETHOSCOPES | Medical instruments for listening to the action of the heart (12) |
| SOUNDSTORIES | Records that allowed fans to listen to the action of 1960s TT racing+. (5,7) |
| RINGSIDE | Seats closest to the action of a boxing match |
| FERMENTED | Subjected to the action of yeast (9) |
| AERATES | Exposes to the action of air - as a tree, maybe? (7) |
| SYNC | Fit the sound to the action (4) |
| ADAPTED | Exposed to the action or effect of air (7) |
| TEETH | Choppers for ET returning to the action (5) |
| RINGSIDESEAT | Position close to the action (8,4) |
| LEANFORWARD | Get in a bit closer to the action |
| UNDERRUN | Word that refers to the degree to which a programme falls short; the action of going, passing or running beneath; or, the current below the surface, whether real or figurative (8) |
| MAOI | Any of a group of antidepressant drugs that inhibit the action of monoamine oxidase in the brain and so allow monoamines to accumulate. |
| TOLERANCE | Ability of the body to resist the action of a poison, endure large doses of active drugs etc. ( 9) |
| EROSION | The wearing away of rocks and other deposits on the Earth's surface by the action of water, ice or wind (7) |
