Possible Clues:

• Feel bad, infected with disease, and come down quickly
• Descend using running rope
• Jack lies about his descent
• Blasé about singular rapid comedown!
• Let oneself down rockface
• Sailors have trouble, we hear, to descend by rope
• In mountain climbing, descend using a doubled rope
• Is able somehow to get safely down to rock bottom
• Is able (anag.)
• Sailor to get under way reportedly and let himself down