I have solved it with the all but these three.
A letter has to be removed from wherever it occurs in the grid entry. So the answer is longer than cells in grid.
11d. Perks up about unionist joy accepting bit of igneous rock from Germany (12)
I have ?UPE?SCH?EER and F is the extra letter. Superschieffer?
26d. Bible book about learner being capable of commanding respect (6)
RVRA?L . E is extra.
Glad we helped, Hankir. I got the word from Chambers, using the K from Perks as I thought that must be involved. There weren't too many words beginning KU.....