Nothing says fun like a birthday crossword

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Across
  1. 2. First day on earth
  2. 3. Not crisps
  3. 4. (7×6)−(4+3)
  4. 6. Not wanky
  5. 7. Formerly shelled
Down
  1. 1. Morning fuel
  2. 3. “Not my ___”
  3. 5. Oink