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Stick-in-the-mud — quadrangle (6)

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

• Quick crossword No 16,553 — 2023-05-25 23:00:17
  15A: Plaza (6)
• Quick crossword No 16,349 — 2022-09-29 23:00:22
  4A: Rigidly old-fashioned (6)
• Quick crossword No 15,210 — 2019-02-06 00:00:25
  15D: Stick-in-the-mud — quadrangle (6)