NODOUBT

Almost certainly (2,5)

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

• Quick crossword No 16,055 — 2021-10-20 23:00:03
  9A: Surely (2,5)
• Quick crossword No 15,334 — 2019-06-30 23:00:37
  23A: Almost certainly (2,5)