Related Clues:

• Be a fink
• Not hold it in
• Filch
• Yak
• Turncoat
• Act the snitch
• Let the cat out of the bag
• One living in a dump
• Underhanded one
• Hamelin evictee
• Start of a drum sound
• Skulker
• Turn in
• Dirty rotten scoundrel
• Talk too much