What did the murderer not wear?

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Across
  1. 5. Be ____: Scout motto
  2. 6. A large gathering of scouts
  3. 8. Name of your scout district
  4. 9. Name of the device used to fasten neckers
  5. 10. Name of a similar movement directed at girls
Down
  1. 1. Name of your explorers group
  2. 2. Founder of scouting
  3. 3. Name given to the youngest members of scouting
  4. 4. Chief scout from 2009 to 2024
  5. 7. Acronym of the national organisation of student scouts