Possible Clues:

• Krakauer's ''Into Thin Air'' locale
• Always it is in Latin, but never is it 1 across
• Always set out with the height of ambition
• "Into Thin Air" mountain peak
• Very high mountain
• At any time set out for peak
• Huge rear — about to slip into underwear, the biggest of its kind
• Metaphor for an ultimate challenge
• First woman to pause where there's a stiff climb
• Page One 58 Across, June 1953