Enjoyed this and thanks for a couple of steers. All complete but there are two answers I am fairly confident are right but am struggling to parse:
12A, I get the first word from not working (3) + line (3). But I can't parse the second, assuming I am right that it is a diminutive ivory tinkler.
6D, Only one word seems to fit my crossers and fits the definition (assuming that is the last four words of the clue). But again I can't parse the first five words.