Hardest crossword

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Across
  1. 3. of a spy's toolkit (3)
  2. 4. Norse god of mischief
  3. 6. One who is financially astute (5)
  4. 7. Not at all certain (5)
Down
  1. 1. state (4)
  2. 2. of "yes" in a classic debate (4)
  3. 5. route taken by a vessel (4)