Possible Clues:

• Set off from Berkshire college in time
• Go boom
• Explode one day outside public school
• Let off appointment college introduced
• Set off to see sweetheart maybe outside school
• Greek character observed in lift set off
• Greek character, famous, returned and set off
• Set off from school in the course of a particular day
• Tend a toe that's injured and set off
• Go off, taking girlfriend around school