Happy Father's Day!

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Across
  1. 4. Fischer and Myron theorised this volatile equation (5,7)
  2. 7. Act of violence often preceded by "Why, you little –"
  3. 8. One of three players alongside Harry Kane and Sergio Aguero to score a hattrick in the Premier League, FA Cup and Champions League
  4. 9. Swiss with much insight
  5. 10. Who gathered O'Gara's kick to touch down in the 2007 Grand Slam win?
  6. 11. Richard Ashcroft led the group that penned this oxymoronic composition (3,5)
Down
  1. 1. Skip, skip, crunch, owwwww
  2. 2. The last PMNI
  3. 3. The only country in Oceania to lie on the Equator
  4. 5. Overtook Tiger as World #1 in 2004
  5. 6. Four golds – pair, pair, four, four