Possible Clues:

• Occasionally spurned girl making proposition
• Careless following philosopher's first assumption
• Head of Police negligent? That's the assumption
• Assumption made by journalists about major highway
• Negligent on parking -- that's what starts argument
• Proposition regularly spurned by girl
• Statement assumed to be true (var.)
• A condition stipulated beforehand
• Proposition assumed by pastor is negligent
• It's assumed homework will be slightly reduced by teacher