Maths Cryptic Crossword

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Across
  1. 4. Millenials know nothing, I expect shenanigans initially (9)
  2. 6. Strangely fab iconic liars are arranged nicely (9)
  3. 8. Clue (8)
  4. 9. Clue (6)
  5. 11. Clue (5,10)
Down
  1. 1. Clue(8,7)
  2. 2. Clue (9)
  3. 3. Clue (5)
  4. 5. Irrational drugs are delicious (3)
  5. 7. Clue (8)
  6. 10. Clue (5)