Related Clues:

• Asphalt covering fifties ring road the ultimate sticky assignment
• 'Stand up straight' in hole?
• Hard to swallow food requested -- not a piece of cake
• Difficult instruction
• Difficult assignment given by high command
• Something difficult to do
• Big undertaking
• *Tough request from a customer (4 to 7)
• Challenge from group of monks of high standing?
• Brothers over six feet? Too much to ask
• Difficult request: a bit of buttered roll? A toastie's offered up
• Big ask
• Request that's hard to fulfill
• Tough challenge
• Difficult task, request for 12oz coffee in Starbucks?