Related Clues:

• Field for guinea pig?
• Topic of citizen in a monarchy
• National history, perhaps
• Vehicle turning up to meet plane containing Canada's foremost citizen
• Sentence focus, grammatically
• The thing or area being discussed
• Part of sentence pupils learn about in English at school?
• Something studied under obligation
• Vulnerable citizen
• Theme of a book, say
• Theme; under control
• A British citizen is the theme
• Dependent theme
• Citizen's aquatic vessel caught in stream