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 32 stops to historic period (8)
23 Backing one to hide Irish works on more than one level (7)
24 A capital problem for the young fools (4)
25 Place of safety for Tesla (4)
27 Detective lacking manners is thrust down (7)
29 The aria played by international flautists (8)
32 Doormen rudely ejecting old and new (6)
34 Host one from Arc de Triomphe ultimately (5)
36 Local pilot flying around California (7)
37 Notice Rob sounding gorgeous (6)
40 Distinguished knight in turn needing these (5)
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