Possible Clues:

• Bacall's frequent co-star, familiarly
• 'Casablanca' star, affectionately
• Leader of the original Rat Pack
• Hobgoblin (Var.)
• Old US star gets one over
• Pivoted group of four or six wheels on an engine
• Bacall's first hubby
• Actor Humphrey's nickname
• Said to be one more than expected in golf trolley
• 'Casablanca' co-star, informally