YANKEEDOODLE

American national song, popular since the War of Independence (6,6)

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

• Quick crossword No 16,638 — 2023-09-01 23:00:27
  7D: Traditional song and nursery rhyme, which predates the American Revolution (the state anthem of Connecticut) (6-6)
• Quick crossword No 16,343 — 2022-09-22 23:00:18
  5D: Old patriotic American song — one key loaded (anag) (6,6)
• Quick crossword No 15,585 — 2020-04-19 23:00:51
  11A: American national song, popular since the War of Independence (6,6)