Cryptic #4

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Across
  1. 2. Combine some old nitrogen with silver and tungsten to make a cart (5)
  2. 4. Reveal all with haricots knocked over (5, 3, 5)
  3. 8. Easy saunter over sweet thing (8)
  4. 11. Dismay of Tory serious at Italy over nuclear (13)
  5. 12. Mobile unionists flustered dictator (6, 9)
  6. 15. Large stone building monarch and gangster hide foul murder (9)
  7. 16. Faces curiously expire around secret police (5)
Down
  1. 1. Business passing on the left (11)
  2. 3. Bring up in Darwin, Churchill and Downing Colleges (5)
  3. 5. Bus reverses into US state hiding resistance vessel (9)
  4. 6. Writer has fish after argument (8)
  5. 7. Camping, we hear, is very serious (7)
  6. 9. Revolutionary invention (5)
  7. 10. Hot curry around Thailand is a killer (5)
  8. 13. Individual regularly pounces (3)
  9. 14. Reverse car to save files (4, 2)