Suffix ian - a noun meaning 'the one who'

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Across
  1. 4. This person studies and writes about the past.
  2. 5. This individual fixes machines and equipment.
  3. 6. This person is a keeper of books in a library.
  4. 7. This person is a walker, traveling on foot.
  5. 8. This person's job is to make people laugh.
Down
  1. 1. This entertainer performs tricks on stage.
  2. 2. This is a doctor who heals and treats patients.
  3. 3. This person's job is to work with wires and circuits.