I agree - with a crossword you should know it's right when you've finished it (correctly, that is), and I didn't find any real confusion with the anagrams (the only confusions are as I've written above).
Surely it has to be elastic? I admit some of the redundant down words could fit in one or two of the across clues (especially when they're operators, such as inside or altering), but the actual word is pretty clear.