Possible Clues:

• Good luck to that little bed of Mother's
• Good-luck charm
• Sidelines star
• On-the-playing-field animal
• Yale's bulldog, e.g.
• Smokey Bear, e.g.
• One leading a cheer, perhaps
• Costumed animal, maybe
• Dinger of the Colorado Rockies, e.g.
• Good-luck critter