Possible Clues:

• Go on and on
• Hike or stroll beside river
• Go on tangent after tangent
• Take a long walk with thriller writer, right to the top
• Go on a long-winded tangent
• Go off on tangents
• Talk incomprehensibly
• Go for a long walk with English novelist, right to the top
• Frenchman gets locked in Back Lounge with the foreign tramp
• Walk or stroll by river