| ASCENT | A climb to the summit of a mountain; or, movement back in time, as in tracing ancestry (6) |
| GENEOLOGY | Study of tracing ancestry - as practised on 1A (9) |
| DNA | Means of tracing ancestry |
| JOHNSNOW | Physician born in 1813, noted for his work in tracing a cholera outbreak (4,4) |
| GENEALOGIST | An expert in tracing lines of decent (11) |
| ASCEND | Climb to the top of Cotopaxi in the Andes, maybe (6) |
| NORGAY | Sherpa mountaineer who accompanied Sir Edmund Hillary to the summit of Mount Everest in 1953 (6) |
| CONQUEST | Achievement of victory through a form of combat whose name is linked to a horse chestnut or "cheeser" used in a playground battle; a successful ascent of a mountain; or, the act/art of gaining a perso |
| SPAN | Distance between the tips of one's thumb and little finger; the wingspread of an aircraft or bird; a stretch of time, as in concentration or life etc; or, the arch of a bridge (4) |
| EDMUND | New Zealand climber ... Hillary, accompanied by Sherpa Norgay Tenzing, climbed to the summit of Ever |
| RIDGES | Crests of a mountain (or a potato chip) |
| PEAK | A pointed or pyramidal summit of a mountain; consistency/shape into which whites are whisked for meringues; or, the brim or visor of a cap, formerly of a widow's hood (4) |
| SCALES | Climbs to the top of |
| APEX | Summit of a mountain; pinnacle of achievement; or, a clipping point of the racing line in motorsport (4) |
| LANDSLIP | Movement of a large mass of rock material or soil down the side of a mountain or cliff (8) |
| LANDSLIDE | The slipping of a large mass of rock material or soil down the side of a mountain or cliff (9) |
| CROW | Word used to describe the summit of a hill or rise; the human forehead; or, a ship's gangway (4) |
| YEAR | Unit of time, as in cauliflower 'All the ___ Round', the end of which is just a few weeks away! (4) |
| MOUNTAINEER | Climber such as Maurice Herzog who, in 1950, became the first person to reach the summit of a peak over 8000m high - it was Mt Annapurna in Nepal |
| TOR | Craggy outcrop of rock on the summit of a hill, as in the hosta variety 'Devon ___' (3) |
