| DAGUERREOTYPE | Early form of photography using mercury vapour in the development process |
| LIFECYCLE | I feel odd about limits to Canterbury Council's development process (4,5) |
| BETATEST | App development process |
| TIMELAPSE | Occasion to drop form of photography (4-5) |
| CONTRAIL | An artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapour in the engine exhaust (8) |
| HUMIDITY | Amount of water vapour in the air, usually expressed in grams per cubic metre (8) |
| CLOUDS | Masses of vapour in the sky (6) |
| CLOUD | Mass of water vapour in the sky (5) |
| DEWPOINT | Atmospheric temperature at which water vapour in the air begins to condense (3,5) |
| SUGER | Advisor to both Louis VI and Louis VII whose supervision of the rebuilding of Saint-Denis as its abbot was key in the development of the Gothic architectural style (5) |
| CUTTINGEDGE | Latest or most advanced stage in the development of something, as in trimming the sides of a lawn! (7,4) |
| YOUTH | Stage of adolescence between childhood and maturity; juveniles collectively; or, the early days in the development of something (5) |
| ABE | ___ Edgington (horse depicted in The Horse in Motion, which is widely regarded as a milestone in the development of motion pictures) |
| ONTOGENESIS | The sequence of events involved in the development of an individual organism |
| EDGE | Knife _, a critical point in the development of a situation, process of making a decision, etc (4) |
| SPINABIFIDA | Congenital defect in the development of the vertebral column (5,6) |
| CREED | Frederick George ____ was a key figure in the development of the teleprinter |
| HESS | Central figure in the development of the Nazi movement under Adolph Hitler, Rudolf ... |
| RENOIR | Leading painter in the development of the Impressionist style (6) |
| INSTAR | The stage in the development of an insect between any two moults (6) |
