Possible Clues:

• It's just too much when rule inhibits fresh starts
• The final irritation that stretches your patience beyond the limit
• The final saint that's untrained can be back-breaking
• Back-breaking assignment drinker was lucky to get?
• The end of the harvest proved back-breaking
• Concluding provocation upset stalwarts
• Stalwarts involved in potential backbreaker
• The final provocation is to hang in there with upsetting imperfections
• Misrepresentation of stalwarts that's the final problem
• A back-breaking weight