Related Clues:

• Old gray mare, say
• Carp, carp, carp
• Gripe
• Shrew
• Pester
• Termagant
• Torment
• Bettor's interest
• Back seat driver, e.g.
• Complain, complain
• Remind too often
• Pick on
• Over-the-hill mount
• Equine loser
• Henpeck