Possible Clues:

• Informer - annoy
• One would rank as an informer
• Grass for N-Noah's?
• Some drug sounds like grass
• Police informer, colloquially
• Pollen at last reaches chest to cause irritation
• One might inform rescue vessel to get bearing first
• Informer's name on chest
• Roderick Random showing up informer
• Spy first of navigators with his ship