Possible Clues:

• Launch attack from cover
• Lie in wait for American president
• A doctor got us to hospital for the attack
• Waylay American president once around end of term
• Scene of lying in wait
• Attack where Cockney might grow meat?
• Lie in wait to see president after a great many
• Launch unexpected attack on leading hospital doctor in Australia
• (Where enemies) lie in wait
• Launch attack from hiding