Maths department Whodunnit

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Across
  1. 3. He's early if he arrives at 8:22am
  2. 5. Loves a 'deep dive'
  3. 6. His TES account is on £20,000
  4. 7. 'Princess mug' thief
  5. 9. Cheese Jokester
  6. 11. Started a bouncy castle company on the side
Down
  1. 1. Who is known for falling asleep after a beer?
  2. 2. Fourth in Charge of the department
  3. 3. We're too scared to make a joke about this person
  4. 4. Who said "Don't you shout across the room, that's my job!" to a pupil
  5. 8. Anyone selling a very fast bicycle?
  6. 10. Eats pizza crust first