Can You Crack This Cryptic?

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Across
  1. 1. Going back into the lair toilet proves a test (5)
  2. 4. Young girl with strange Spanish pram becomes loathed spinster (4,6)
  3. 5. They deduct why muddled E.T. evicted (9)
  4. 6. Detective’s current job sees troubled lovers initially leave the castle (4)
  5. 7. Sidekick sounds like he will regret speeding (8)
  6. 11. In a Hindu town perhaps the criminal is revealed at the end (9)
  7. 12. Sees crime - now nearly witless (7)
  8. 13. Knife injury is a .... in the dark (4)
  9. 14. He touched the artwork, leaving this behind (11)
  10. 15. My tyres spin – it is an enigma (7)
  11. 16. Copper within interpol ices criminal (6)
  12. 17. Cipher found key word within encoded document (4)
Down
  1. 2. Sound like aunts err in response (6)
  2. 3. Oddly collude to find hint (4)
  3. 5. Find the record has ended (8)
  4. 7. Extremely hungry cats prowl for food (5)
  5. 8. Midnight at the United Nations - murder weapon discovered! (3)
  6. 9. Artistic space where Poirot sums up the case (7,4)
  7. 10. Loves confusion but finds answer (5)
  8. 15. She demurred, confused, ‘they died by violence?’ (8)