Related Clues:

• Back-breaking assignment drinker was lucky to get?
• American city road is converted into gold by Rumpelstiltskin? Presumably, it does beasty type no good!
• One blow too many for former foreign secretary
• This could make even stalwarts crack up
• Unbearable part of the camel's load
• Learner botching start was the ultimate irritation
• Endure growths coming up? Something ultimately exasperating
• This the camel found unbearable
• Endures temperature, cold and damp that's ultimately unbearable
• Repeatedly street artist breaks rule -- that finally does it
• Limit regulation covering two streets and road, oddly
• Continue with a type of hat which eventually overburdens you?
• Back-breaking stress carries on over time, untreated
• *Breaking point
• Take on ex-Foreign Secretary, showing tipping point in exasperation?