| SUNDOG | Explained in Minnaert's Light and Colour in the Open Air, a parhelic bright spot on the 22 degrees halo caused by diffraction by ice crystals in clouds, often showing prismatic colours (6) |
| TURNER | Depicted by Timothy Spall in a film, an artist noted for his rendering of atmosphere through treatment of light and colour in more than 2,000 paintings (6) |
| PLAGE | Bright spot on the sun |
| FACULA | Bright spot on the sun |
| NNE | About 22 degrees |
| HALO | Parhelic circle |
| CONE | One of the cells in the retina sensitive to bright light and colour (4) |
| FRENCHTOAST | Breakfast order whose first word is the language spoken in Paris and whose second word anagrams to "stoat": 2 wds. (Theme answer: The relationship of the circled and uncircled letters is explained in |
| AMBER | Form of fossilised tree resin used for jewellery; or, the traffic light and colour acting as a cautionary signal between red and green (5) |
| BLIP | Bright spot on a radar screen |
| MOONDOG | Bright spot on a meteorological halo |
| PARHELION | Atmospheric ice-crystal halo and glorious light show whose etymology perfectly reflects the phenomenon's appearance: a bright spot appearing beside the Sun, hence "mock sun" (9) |
| GAS | Expanding to fill any space, a state of matter whose behaviour, based on the motion of its particles, is explained in the kinetic molecular theory (3) |
| LILAC | Leaders in light and colour (5) |
| NEWTON | His Opticks is a study of light and colour (6) |
| FLUSH | A rapid flight, spring up or start of game birds; a suffusion of crimson colour in the cheeks; a sudden flow of water; a fresh growth of foliage, flowers or fruit; or, a feeling of excitement (5) |
| STARLIGHT | You have the right to the last bright spot in the proceedings (9) |
| MAIDAVALE | One on the 22 with beer in it, we hear? (5,4) |
| MILEEND | One on the 22 in general confined to memory (4,3) |
| INDIGO | A wistful mood type with a blue hint, but mainly the colour in the spectrum preceding violet's tint (6) |
