Jacob’s Cryptics

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Across
  1. 3. Midway through shower, concealed A4 needs to be signed. (6)
  2. 4. Flow state ends with British Bill returning milk without carton? (6)
  3. 6. Donkey back end in highly unethical butcher? (8)
Down
  1. 1. Air moving in circles. (4)
  2. 2. Rapid eating suggests foul play! (4)
  3. 5. Quick ‘A’ interjection without front incisors? (5)
  4. 7. Back-to-front pants missing bottom button sprayed bodily fluids! (4)