Possible Clues:

• Set off an explosion
• Discharge English soldiers seen retreating
• When you set off, note return date on the outside
• Set off to have meeting about school
• Be charitable about alien getting let off
• Set off from meeting around school
• Famed (reversed) + Consumed = Go off
• Cause explosion on a certain day in public school
• Set off for assignation outside school
• Set off explosive device