Related Clues:

• Snake in the grass, e.g.
• Lawn green
• Jailhouse fink
• One not to be trusted
• Squeal on
• Gnawing critter
• Cat's prey
• Lab-maze runner
• Squealer - or squeaker
• Wrongdoer's bane
• Grass
• Move surreptitiously
• Hardly a good friend
• Creep about
• Slum sight