Clockwise round the perimeter from 3 run the titles of three items (1, 6, 3, 1, 4, 2, 1, 4, 1, 4, 3, 4, 5, 6, 3, 4) from the same source, the title of which is epitomised by the four unclued lights. Ignore two apostrophes.

Across

8    Slowly cycling with a bouquet? (5)
9    Party hit the roof in court (6, hyphened)
10    Man feels relaxed and gets angry no more (8)
12    Poet’s precious metalon the other side of Scotland (4)
14    How airlock puzzled tireless toiler (10)
15    Silkworms stupidsort uses (8)
20    Dish with oomph is round cuddling that man (7)
21    Small group of...