I'm a Walking Advertisement.

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Across
  1. 4. Being committed and consistent to someone or something.
  2. 6. A large board that displays outdoor advertisements.
  3. 9. A business or an organisation.
  4. 10. A symbol that represents an object or idea.
  5. 11. Doing something that is sly or in secret.
  6. 12. When you do something that is sneaky, or so no one notices.
Down
  1. 1. A design or logo that covers the whole part of the chest.
  2. 2. When something or someone deserves praise or honour.
  3. 3. A word meaning hardly or only just.
  4. 5. Something that is popular at a certain point in time.
  5. 7. When people react against something in the same way.
  6. 8. Something that is made and often something that is then sold.