| THECASCADES | Pacific Northwest range, three of whose peaks end 17-, 24 - and 47-Across |
| AUTOCORRECT | Smartphone texting feature, which usually detects and fixes the thing hidden in 17-, 24- and 47-Across |
| ROUGHSTART | Inauspicious beginning, or a feature of 17-, 24, and 47-Across |
| DCTEN | Long-range three-engine plane |
| QUIDDITCH | Game that ends when the snitch is caught ... and whose positions end 17-, 24-, 36- and 48-Across |
| HIMALAYAS | Asian mountain range whose peaks include Annapurna and Kanchenjunga (9) |
| RUFUS | ... author of 10, 14, 17 24 and 19 with setter's surface raised high - and so say all of ___ ! (5) |
| FIRESTARTER | 1984 Drew Barrymore movie, and a description of the first words of 17-, 24-, and 47-Across |
| ALPS | European mountain range whose peaks include Mont Blanc (4) |
| ANDES | Mountain range whose peaks include Aconcagua (5) |
| ONTHEMONEY | Exactly right ... and where parts of 17-, 24- and 47-Across appear |
| MASSIFCENTRAL | Great mountainous plateau in southern France whose peaks include Puy de Sancy |
| CENTRAL | Great mountainous plateau in southern France whose peaks include Puy de Sancy (6,7) |
| MASSIF | Great mountainous plateau in southern France whose peaks include Puy de Sancy (6,7) |
| MAGNUSCARLSEN | Current World Chess Champion whose peak rating of 2882 is the highest in history (6,7) |
| USPS | Grp. whose peak season is between Black Friday and New Year's |
| EVEREST | Summited by beekeeper Edmund Hillary with Tenzing Norgay in 1953, Earth's highest mountain whose peak sits in the upper troposphere (7) |
| HOB | Big shot doesn't get gist of what's on the range (3) |
| EAR | Listener at head of extra auditory range (3) |
| AGA | Cooking and heating range (3) |
