As for solving the CG, I concentrated on TQUU with the double letter and thought of a word that fit with, EX with X being what I hoped it was. That led to recognizing the author’s name (resulting in face-palm, duh!) . After that it became easy to fill in the rest.
Double letters at the end of the word are almost always gonna be the letter L. But I’m sure you know that by now. Then you’re off to the races.