Possible Clues:

• Hero from Grease coming up north
• Detroit pro
• Yellow Brick Road traveler
• Savanna predator
• Sounds as if one can't believe the beastly king
• Jungle predator
• Meaning of 'Simba' in Swahili
• Savanna stalker
• Great Britain's emblem
• The sort of thing that's beastly might sound like a 23 down