The unclued entries have something in common, and are the most recent of their type. One umlaut should be ignored in these entries, and elsewhere an accent.

Across

1 Perhaps not swinging is sordid (5)

4 I might get candy floss. Like some chocolate? (9, two words)

10 State with importance line interrupts fluency (10, two words)

11 Local watery path to utilise crossing island (6)

12 Recycled material for further education that’s fabulous (7)

14 Art cleaning the same estate (5)

15 Some anxiety managing roots (5)

16 Rowboat in trouble without this at first? (6, hyphened)

22...