| AEROBE | A micro-organism indicates the atmosphere on Brisbane outskirts |
| AERO | That which indicates the atmosphere outside Adelaide rooftops |
| BELL | Ring Brisbane outskirts on the last ball |
| BEINGS | Persons from Brisbane outskirts in Gilbert and Sullivan |
| STABILATE | Population of a micro-organism, preserved on a single occasion, for example by freezing |
| AMOEBA | A micro-organism of extremely basic anatomy, primarily |
| GERM | Gave out royal mail initially to a micro-organism |
| TOXIN | Poisonous substance produced by a micro-organism |
| FALLOUT | Solid particles that descend from the atmosphere on to the Earth following a nuclear explosion (7) |
| ICEBREAKING | Thawing the atmosphere on English holiday in topping setting (11) |
| HYDROGEN | Element with helium that forms the atmosphere on Jupiter and Saturn (8) |
| INCIDENTALMUSIC | Heard slightly different Gangsta Rap after event adds to the atmosphere on film (10,5) |
| BUG | A word for an object of dread originally, later a creepy-crawly or minibeast; a harmful micro-organism or viral disease; a gremlin in a computer system; or, a miniature microphone, hidden for secret e |
| TESTATOR | Has a will to check out extreme atmosphere on The Hill (8) |
| KRILL | From Norwegian for "small fish fry", a micro crustacean forming one of Earth's largest biomasses and constituting the principal food of the largest living animal, the blue whale (5) |
| NAIROBI | No hiding atmosphere on British island with the green city in the sun (7) |
| CAFETERIA | Eatery originally conveyed a festival atmosphere, on reflection |
| AIR | Atmosphere on a G string (3) |
| EERINESS | Atmosphere on "The Twilight Zone" |
| BUBBLECAR | A micro vehicle like the Isetta (6,3) |
