Have enjoyed this puzzle and appreciate the effort that Maskarade has put into providing many people with this huge offering. Solving 15 Across first of all, provided me with much of the theme work, but I am
left with one query. That applies to 17 Across, which someone earlier hinted at as having two possible answers, but I have only heard of one of them, and have entered this. Can't quite parse this tiddler though, so was just wondering whether "active" (as in the clue) could be abbreviated to "A", or does "active" have some other connotation?