Many thanks again PS and Brendan.
Got it! It took me ages to get the anagram as I had so few crossers, but once I got the H in 12ac I was able to decide which words formed the anagram and work through all possible words that included the letters I had and I got 7d. Then it was a mere moment to getting 8d. After that I was able to get 5ac, 6d and finally 10 ac. Actually that wasn't finally. Many thanks for the more detailed clue for the pig in 4d. I'm still not sure where the "go quietly" came in.
Then I remembered that doctor means anagrind which explained the only answer for 5d. My husband is serving up dinner, so I can eat in peace