ORDERLY

Well-behaved — soldier attending to a superior officer (7)

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

• Quick crossword No 15,670 — 2020-07-27 23:00:06
  13A: Neat and tidy (7)
• Quick crossword No 15,539 — 2020-02-26 00:00:03
  15D: Well-behaved — soldier attending to a superior officer (7)