SLIP

Mistake — small piece of paper (4)

Solution has appeared in 3 crosswords (1 across and 2 down):

• Quick crossword No 16,002 — 2021-08-19 23:00:18
  17D: Lingerie item — bit of paper (4)
• Quick crossword No 15,837 — 2021-02-09 00:00:56
  5A: Careless mistake (4)
• Quick crossword No 15,386 — 2019-08-29 23:00:08
  2D: Mistake — small piece of paper (4)