Hi Rosie. This was a very tricky but extremely well set and enjoyable crossword.
It was comparable with the standard of a Listener puzzle.
You do not say which misprints you have but the 3 I felt were well disguised were 37a, 29d & 40d. You should be able to get the author from those.
A further difficulty is that there are two possible works by the author which fit the theme.
If you google the letters you have solved from the affected clues, you should see the relevance to 27d. The shape of the 7 clues in the grid will confirm the title.
Finally there are two different endings to 27d depending on how you constructed the anagram. The two different letters should both be placed in the same cell.
Good luck.