Possible Clues:

• Like to get as little money as this by way of a rise?
• Climb a trail?
• It's up like the last one of 13 across
• Balloonist's beginning
• Half of a mountaineering trip
• A nose for getting up
• A track up the mountain?
• Up with what one knows what to get, by the sound of it
• Like to get a little money up here?
• Spoken agreement made by Hilary and Tenzing