Still looking for some ideas on 26dn. I think the letters I have are correct. The only word that fits is 'expiator' but can't see any connection to clue.
Just realised the answer is 'emphatic'. The compiler has cheated a bit as I had the answer to 38 ac as 'tendonitis' - the obvious and known spelling whereas he/she must have spelt it 'tendinitis'.