Related Clues:

• Cheat sheets
• Former fillies
• Stable parents
• Deliverers of express mail?
• You can bet on them
• Small liquor glasses
• Some racehorses
• Kind of nest
• Stallions' mates
• Stable mates
• They're played at the track
• Female horses
• Shetlands, e.g.
• Fillies' mothers
• Ranch females