| NOTON | It's impossible, climbing or descending (3,2) |
| RADAR | It locates aircraft climbing or descending |
| SCALE | Group of notes in ascending or descending order (5) |
| AORTA | "Ascending" or "descending" body part |
| STAIR | Support consisting of a place to rest the foot while ascending or descending a stairway. |
| LEGUP | Assistance lent in climbing - or in idiom (3-2) |
| BOARD | Climbing or running (5) |
| IVIES | Woody climbing or trailing plants with evergreen leaves (5) |
| VINES | Climbing or trailing woody-stemmed plants (5) |
| ICANT | "It's impossible!" |
| NOWAY | Right out of the country? It's impossible (2,3) |
| LIMIT | Impose bounds beyond which it's impossible to go (5) |
| VENUE | What's required when it's impossible to empanel an unbiased local jury, a change of ... |
| ACLUE | Apology from Gaff that it's impossible to solve 6d (2,5,1,6,1,4) |
| GLISSANDI | Series of rapidly ascending or descending musical notes (9) |
| GLISSANDO | (Musically) a rapid series of ascending or descending notes (9) |
| NUMERICALORDER | It can be ascending or descending (... letters 9-13) |
| PURCHASE | An acquisition; that which is bought; or, a firm grip, hold or stance when climbing or levering (8) |
| RAMBLER | A rover or wayfarer who enjoys long walks in the countryside; a climbing or trailing plant, such as a multiflora rose with clusters of small fragrant blooms; or, a babbler, lacking organisation in spe |
| CRAMPON | One of a pair of frames fitted with metal spikes, strapped to boots for climbing or walking on ice or snow (7) |
