What new is there to say about Dac? Every clue tells a little story. I have misgivings about ‘provided’ as an anagram indicator in 4dn, and I suspect that there might be a typo in 12dn, since my suggestion is so simple that I can’t see why Dac didn’t do it that way (although now that I look more closely he may be right all along, the two words necessitating a verb without s; not sure about this — perhaps someone who knows about these things could drop in and tell us); but a small price to pay for a day of Dac.
Definitions underlined.