Canary, so to speak
Else clues• Barton ___
• Act the rat
• Automatic teller?
• Be a snitch
• Bean spiller
• Betrayer
• Betrayer of confidences
• Disloyal sort
• He rats people out to the fuzz
• Informer
• Obnoxious sort
• Rat
• Rat on
• Singer?
• Snitch
• Soprano canary
• Squealer
• Stool pigeon
• Stoolie
• Strikebreaker
• Whistle-blower
• Someone acting as an informer or decoy for the police