Possible Clues:

• Brazil, for example, can be a difficult opponent (1,4,3,2,5)
• Difficult puzzle, e.g
• Difficult person to influence in Brazil? (1,4,3,2,5)
• A difficult problem to deal with, for a squirrel? (1,4,3,2,5)
• Cool customer from Brazil? (1,4,3,2,5)
• Something baffling
• Brazil could be difficult to beat (1,4,3,2,5)
• Brazil is a formidable opponent (1,4,3,2,5)