whistler, apology for late response to your post, and I expect you've sorted everything by now, but if not......Your 11-letter name takes 6 alterations to arrive at another thematic term (7,7).
Try writing the answers to the three normal clues in clue order in a straight line. Bearing in mind the quotation, I am sure you will see the name of a group appear.
Hope this is not giving too much away but also helpful.