Possible Clues:

• Special constable not allowed to reconnoitre
• The nickname of the narrator of Harper Lee's To Kill a Mockingbird
• "To Kill a Mockingbird" narrator
• “To Kill a Mockingbird” girl
• Thin Mints seller
• Spy that is briefly exposed
• Spy who might make meal from mescal
• Seek (out)
• He must be prepared to reconnoitre
• One promising 'to help other people at all times'