I used to blog quite often after midnight, when the crossword for the following day appeared on the website, but stopped doing so because I would become rather sleepy and tended to make silly mistakes. On Tuesday evening I had a long and ultimately fruitless game of chess, so was wide awake at midnight and decided to revert to old habits. There may be silly mistakes in the blog: certainly there were several answers where the parsing was not clear to me until I spent quite some time on them, and perhaps in the morning I would not have felt that this was on the tricky side for Dac.
All the usual remarks about Dac go without saying.
Definitions in italics.