Related Clues:

• Unlikely race winner
• Old chestnut?
• Bettor's interest, perhaps
• Racehorse, slangily
• When said three times, comment of annoyance
• Racehorse, to a bettor
• Really get on
• Dobbin
• Emulate Xanthippe
• Badger or hound
• Bitch and moan
• Horse at the track
• Old gray mare, e.g.
• Pester constantly
• Act like a shrew