Related Clues:

• Grousing spouse
• Back-seat driver, e.g.
• Worn-out horse
• Keep reminding
• Pester incessantly
• Horse put out to pasture, maybe
• Carp at
• Pester persistently
• Remind too much
• Subject of a tipster's tip
• "Camptown Races" winner
• Slowpoke at the track
• Over-the-hill horse
• Not just nudge
• Be a pest