Related Clues:

• 'Cheese' sayer
• Translation of prose is a problem
• Prose form that gives difficulties
• In response, fires operative back a difficult question
• Model problem
• Model conundrum
• Awful person with no end of affectation?
• A hard question for one, a sitter for another
• Problem - model
• Model - problem
• Question - a sitter
• Conundrum - model?
• Someone behaving so as to be noticed
• Problem to be solved
• Full-scale model built for experimental purposes