Possible Clues:

• Bill has drum sent round for circus artiste
• Tightrope-walker
• Gymnast attaching label to whale as it surfaces
• At times one's life is in the balance
• Clyde Beatty-Cole Brothers Circus job for 117-Across
• Circus act on a high wire, perhaps
• Athletic type driving killer back with club
• British invested in a Balkan gymnast
• One falling head over heels in love with eccentric woman after car crashes
• One who might be in for a fall