The 12 thematic unclued lights form the second half of an alphabetical list, one solution finally and another first and last.

Across

 4    Kitty stewed apricots as single snack (6,5)

11    Saw English animals (7)

13    Around Tyneside Freddie New established new credentials (9)

21    Forty winks before beginning to exercise back of neck (4)

23    Incident is described in poem (7)

24    Up to no good, after end of shift (4)

25    Disentangle one French theme word here (7)

31    Assumed name I omitted, sadly (4)

32    Actor just refusing lead on All Saints’ Day (7)

34    Thank you note for collection of pictures (4)

37    Otherwise, one fine century, on...