Related Clues:

• Person mimicking
• Challenging puzzle
• Tough riddle
• Mimicry expert
• Frank Caliendo, for one
• Puzzle or fashion model
• Difficult question
• One who's often not himself?
• One playing the copycat
• Confusing query
• "Me too" sort
• "Monkey see, monkey do" practitioner
• One making a good impression?
• Impressionist?
• Perplexing problem