Possible Clues:

• Wrestling move that involves a leg twist
• Initial bit of progress
• Not quite a foot in the door?
• Purchase ordered: love what’s included!
• Opening for a rock climber's foot
• What climber may need to carry crossing face of Eiger
• Small purchase
• Hotel do breaks: it’s what the climber needs
• Position of initial advantage from which further substantial progress might be made
• Tiny ledge for climber to view, lacking breadth