Finally finished this but only after making it infinitely more difficult than it needed to be. I looked up the first two words of the theme work and saw it was the name of a constellation, so I did this again with the word in row 1 and, unbelievably, another constellation!! What are the odds? Hence, I tied myself in knots trying to fit other non-existent ones in (Malone - hence "skyish").
Of course, those first two words were, as you'd expect and as Malone tried to tell me, an indicator and a category but I was just too far down the rabbit hole to see it 😫
Still, thanks to Nudd for an ultimately enjoyable puzzle:-)