Cluedunnit

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Across
  1. 2. What instrument is used to measure wind speed?
  2. 6. What is the world's largest living rodent?
  3. 11. Which blue-green colour shares its name with a gemstone?
  4. 12. What type of fraudulent investment scheme takes its name from an Italian-born swindler called Charles?
  5. 14. Which tart-tasting plant is eaten for its thick red or green stalks while its leaves are poisonous?
  6. 15. What is the anatomical name for the collarbone?
  7. 16. Which Dickens character trains a group of children to become pickpockets in Oliver Twist?
  8. 17. What nickname is given to the young pickpocket Jack Dawkins in Charles Dickens's Oliver Twist?
  9. 18. Which 1983 Heathrow robbery unexpectedly netted the thieves tonnes of gold bullion?
  10. 20. What is the largest moon of Saturn?
  11. 21. What tiny shrimp-like crustaceans form a major part of the Antarctic food chain?
  12. 23. Which breed of horse is particularly known for its distinctive spotted coat?
  13. 26. What is the surname of Sherlock Holmes's criminal mastermind nemesis Professor James?
  14. 29. Which basic taste is particularly associated with glutamates and savoury foods?
  15. 30. What word describes either of the two times each year when day and night are approximately equal in length?
  16. 32. Which fictional criminal mastermind is played by George Clooney in the Ocean's film series?
  17. 33. What term describes a recurrent uncontrollable urge to steal items?
  18. 34. Which herb is a traditional key flavouring in béarnaise sauce?
  19. 35. What geographical measurement tells you how far north or south of the Equator a place is?
  20. 36. What red spice is traditionally made by grinding dried peppers?
  21. 37. Which chemical element was first identified in the Sun's spectrum before being discovered on Earth?
Down
  1. 1. What Roman defensive structure stretches across the north of England from coast to coast?
  2. 3. What name is used for the unidentified man who hijacked an American airliner in 1971 and vanished after parachuting from it?
  3. 4. What name is given to the central wedge-shaped stone at the top of an arch?
  4. 5. Which Croatian city on the Adriatic coast is nicknamed the Pearl of the Adriatic?
  5. 7. What confection is traditionally made principally from almonds and sugar?
  6. 8. What type of poem traditionally consists of fourteen lines?
  7. 9. What hot wind blows northwards from the Sahara across the Mediterranean?
  8. 10. Which mathematician gives his name to the sequence beginning 1, 1, 2, 3, 5, 8?
  9. 13. What geographical term describes a group or chain of islands?
  10. 19. What cave formation hangs down from the ceiling rather than growing upward from the floor?
  11. 22. Which former maximum-security prison sits on an island in San Francisco Bay?
  12. 24. What lines on a weather map connect places with equal atmospheric pressure?
  13. 25. Which Australian island is separated from the mainland by the Bass Strait?
  14. 27. Which small Australian marsupial is particularly associated with Rottnest Island?
  15. 28. Which American gangster was killed outside Chicago's Biograph Theater in 1934?
  16. 31. Which purpose-built city became the capital of Brazil in 1960?
  17. 33. What is the name of the mysterious criminal mastermind at the centre of The Usual Suspects?
  18. 34. What Indonesian food is made from fermented soybeans pressed into a firm cake?
  19. 35. What surname belongs to Maurice Leblanc's fictional French gentleman thief Arsène?