I am in the strange position that I have a grid fill, know the theme, can modify the answers to the normal down clues, can draw the thematic number and can modify the remaining down entry. However, I cannot make any sense of the wordplay-only clues determined by the extra words, even when I think I know what the answers ought to be. So theoretically I have solved the puzzle and can submit my amended grid. But there is this missing (and, it seems, unnecessary) step which is frustrating!