ECHELON

Body of troops arranged in a line (7)

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

• Quick crossword No 15,523 — 2020-02-07 00:00:53
  7D: Level or rank in a group (7)
• Quick crossword No 15,273 — 2019-04-19 23:00:07
  8A: Body of troops arranged in a line (7)