Possible Clues:

• Creekborne and paddleless
• Experiencing serious traffic
• Sugary plums and raspberries produced in a difficult situation
• Needing to be bailed out, maybe
• With one's back against the wall
• Needing to be bailed out ... or where 20-, 27-, 45- and 51-Across may be found
• Having trouble with sugary plums and raspberries, for instances
• Facing difficulty
• Needing help
• Processed fruit may be this awkwardly placed