Possible Clues:

• Reckless fling?
• Cause to happen
• Cause to happen suddenly or too soon
• Peripatetic (anag) — trigger
• Headlong plunge
• Done without careful consideration
• Cause (a bad event) to happen prematurely
• Cause (an event to happen)
• Headlong plunge?
• Putting out receipt to include a tip given back is rash