Three unclued lights together form an eight-word question from a well-known song. The song’s protagonist suggests the other five unclued lights (including one hyphened), which are anagrams of words of a kind (including one of two words), all confirmed by Chambers.

Across

1 Spectre behind paper awning (8)

8 Fellow enters Washington Democratic Party (4)

13 Poet suitable for everyone in a study (5)

14 They succeed with shots in archery (7)

15 Admiral one’s seen on the water (5)

16 English with last word about evacuation procedure (5)

21 After some years, new church shows moral decline...