Related Clues:

• Traffic stopper
• D.E.A. operative
• Pusher pursuer
• Sodium chloride
• Bust maker, for short
• Mariner
• Prosecution witness, maybe
• Undercover person
• Mule buster
• See 63-Down
• Source of some cures
• One watching for traffic
• Drug agent, slangily
• It may be added in a dash
• Pretzel topper