CLOT

Thrombus (4)

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

• Quick crossword No 15,560 — 2020-03-21 00:00:22
  23D: Silly billy (4)
• Quick crossword No 15,340 — 2019-07-07 23:00:07
  9A: Thrombus (4)