Dylan, for 19d I have a common word for peculiar (strange, odd) and 14 clashes without any in 19d. However, although I've completed the end-game I'm stuck on 18a (although I have an idea but can't make it work with the required extra letter) and 35a. In theory I should know what the clashing letters are (in order to produce the required letter) but, no joy with that approach either.