One artist’s ten-word comment on a critic runs round three sides of the perimeter; who spoke of whom fills the top line. Other unclued lights name two works by each: two of three words each, one pair, and one pair totalling four words.

Across

10    Insignificant type dropped in a river? That’s enough! (8)

12    Tough not to sound disgusted (3)

13    Secret agent holds the floor (5)

14    Creature has cuckoo sickness (6)

15    Thin, I am ordered a vitamin (7)

17    Fallen angel’s joy cut short on Earth (5)

19    A little bit of thanks to the Moon (4)

20    Old simpleton’s new beginning (4)

23    Witness takes in...