Related Clues:

• Critic who won't quit
• Constantly criticize
• Silver's following Tonto's third horse
• Horse — badger
• Slow-moving bay, say
• Trouble concealed by espionage
• Do needling
• When repeated, spouse's complaint
• Gripe nonstop
• Old gray mare, perhaps
• What agent does when you blow a deadline
• Ask 'Can I?' repeatedly, say
• Pester with a honey do list
• Hound and pester
• Track runner, to a tout