Possible Clues:

• Set off in time, ahead of scaffolder
• Set off — character in Only Fools and Horses
• Set off first of rockets held by one of Pooh's friends
• One sets off, going from the outside into German city
• Go-getter importing goods set off
• Set off from Thailand by ship
• Heartless gang imprisoned by judge, one of those firing gun?
• Set in motion
• Pooh’s friend is about right to set off
• The horse interrupts one trying to set off