EGGSHELL

Paint with slight sheen (8)

Solution has appeared in 2 crosswords (2 across and 0 down):

• Quick crossword No 15,933 — 2021-05-31 23:00:35
  11A: Fragile exterior (not to be walked on!) (8)
• Quick crossword No 15,533 — 2020-02-19 00:00:40
  17A: Paint with slight sheen (8)