SILO

Cylindrical storage tower (4)

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

• Quick crossword No 16,629 — 2023-08-22 23:00:10
  22A: Underground structure for holding a ballistic missile (4)
• Quick crossword No 16,011 — 2021-08-30 23:00:07
  14D: Grain tower (4)
• Quick crossword No 15,203 — 2019-01-29 00:00:17
  18D: Cylindrical storage tower (4)