UNSURE

Doubtful (6)

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

• Quick crossword No 16,626 — 2023-08-18 23:00:02
  15A: Not certain (6)
• Quick crossword No 16,317 — 2022-08-23 23:00:18
  17D: Doubtful (6)