Possible Clues:

• Tension-relaxing time
• Thriller writer made ten (ten!) errors, including relaxing of tension
• Briefly consider drinking wine for relaxation
• Thaw sees river submerging home for a time
• Judge mostly consuming red wine for relaxation
• Lessening of tension despite camping equipment being put into the river
• Easing of relations
• Relaxation of tensions
• Slackening of tension - and camping equipment's in river
• Warming, of sorts