Related Clues:

• More than a pest
• Terrify
• Dennis of comics, for one
• Loose cannon
• Rattle a saber at
• Shark, e.g.
• 'Dennis the --'
• One waving a loaded gun, e.g.
• Dennis' tag
• Hank Ketcham's Dennis, e.g.
• Growl at, say
• Put in peril
• Serious threat
• Ketcham's Dennis, for one
• Threat or severe nuisance