I have it now, thanks. Problem, the theme word is not in the on-line Chambers, but is in (singular) in 13th edition. And the long entry, to be unjumbled, is not in either.
Presumably the long entry, unjumbled, is not one of those to be shaded, so another one has to be found, besides the 4 examples given. OK.
I really do not like the nondescript ending to the instruction down the LH clues. This borders on the nonsensical.