UNPRECEDENTED

Never done before (13)

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

• Quick crossword No 16,630 — 2023-08-23 23:00:10
  4D: Ground-breaking (13)
• Quick crossword No 16,085 — 2021-11-25 00:00:45
  21A: Never done before (13)