THWACK

Hard blow with a flat object (6)

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

• Quick crossword No 16,172 — 2022-03-08 00:00:55
  4D: Smack sharply (6)
• Quick crossword No 15,795 — 2020-12-21 00:00:31
  17D: Sharp blow (6)
• Quick crossword No 15,467 — 2019-12-03 00:00:06
  25A: Hard blow with a flat object (6)