Wow - well done, I have a long way to go.
I do, however, have 7 A - it's a Scottish word, was in Chambers. Let me know if you'd like me to (try to)give you an other hint.
I think I have the answer - 3rd letter is L and last letter is S.
As you said, the correct letter is E. But what word in the clue does E go in as the correct letter?
Boreas, I was starting to doubt my answer for 7 A - it was one of my early misprints/corrections/changes.
Help with any two on your list would be great - say 20 and 26? Thanks.