Some tricky clues and I found a couple of the four excess words quite hard to spot. I still don't see the need for the first two words in 13 across. I'm also not convinced I have made the required changes correctly. Applying the source to the grid doesn't seem to be clear cut. Otherwise, an enjoyable puzzle.
But definitions do not need to have to have only one possible answer, that's why there is the word-play component. By the same argument, isn't the definition in 1 down insufficiently accurate.