Thanks robp86 and drxx. Re 21a I got fixated on an attorney general at the time of the civil war that produced an 's' (having assumed time was 't'. It all seemed quite neat...as he'd served in the war...but not as a general. Doh!
For 39 the only way I could make it work was as special constable but knew that was a big stretch for specifically. Couldn't find any other sc abbrev in Chambers that seemed likely.
Still, it's an improvement to complete unaided, even if I didn't parse everything. Oh. Not completely unaided now I think about it. 38a beat me completely.