Related Clues:

• You can bet on it
• Pimlico entrant
• Rodeo mount
• Before play or opera
• Farm mom
• Steed or stallion
• Foal's mom
• Dark part of the moon
• It could follow the first word of 17-, 24-, 50- and 61-Across
• Stable female
• Groom's responsibility
• Derby racer
• Sire's mate
• Tout's pick
• Nag, maybe