Related Clues:

• Pick on
• Over-the-hill mount
• Equine loser
• Henpeck
• Old horse
• Harry
• Bother persistently
• Bother a lot
• Backseat driver, e.g.
• Vex
• Prey on one's mind
• Pick, pick, pick
• Complain constantly
• Bother incessantly
• Faultfinder