Final clue

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Across
  1. 3. Present tense third-person singular of be
  2. 4. A star is...
  3. 5. Article
  4. 6. Opposite of off
  5. 7. It´s nice on a Valentine's evening
Down
  1. 1. One of the five Ws
  2. 2. Having been discovered by chance
  3. 5. Article
  4. 8. A painter is such