Related Clues:

• Torment
• Bettor's interest
• Back seat driver, e.g.
• Complain, complain
• Remind too often
• Pick on
• Over-the-hill mount
• Equine loser
• Henpeck
• Nitpick
• Old horse
• Bother persistently
• Bother a lot
• Trivial objection
• Backseat driver, e.g.