Related Clues:

• First thing that sparks interest
• Chief - teacher?
• General rule, so to speak, for one fighting duel
• Head teacher
• British civil servant quoting a law?
• Headmaster's guiding theory given in report
• Stop fundamental truth being proclaimed
• First in order of importance
• Cardinal rule, say
• Head's essential nature comes through in speech
• ...leading actor or capital
• Chief source of interest
• Capital invested in head of school
• Head first
• The boss derives interest from it