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Is it? Wiki listed them as in the puzzle but I’m no expert on the topic

Have finished except for half the perimeter.

Good fun!

Thanks Degen

It seems to me that there is ambiguity as to the highlighting of the bottommost of the three forms. There is a choice of cells for the final letter. I guess the obvious one is correct as it's better for the final shape

Help appreciated with my last one, 2d. Can't decide if it has extra word or misprint.
Still missing one extra word.
Maybe it's in 3d as I can't parse, but have the answer.

Misprint, Lumen, and your 'maybe' is correct.

Lumen, in 2d. Def is the last 4 words, with a misprint. It's an anagram.
In 3d. the last 6 words have a 3 letter synonym ( listed as a 4-letter word in Chambers)

Thanks for quick response, both.
I don't feel in the least stupid for not getting those two! Very hard.

Thanks, mattrom, I too had missed that synonym in Chambers.

buzzb @9, thanks for that, I googled the first word and the answer but nothing came up. You've put my mind at rest.

As a newcomer to this forum I've been reading everyone's posts with interest. Nobody seems to have had any trouble with the one clue that has stymied me: 11 across. I'm only missing 2 letters (assuming that my crossing answers are right) and know what the misprint is, but just can't see it...