HARUMSCARUM

Happy-go-lucky — a rum car hums (anag) (5-6)

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

• Quick crossword No 15,931 — 2021-05-28 23:00:09
  6D: Reckless (person) (5-6)
• Quick crossword No 15,853 — 2021-02-27 00:00:09
  12A: Happy-go-lucky — a rum car hums (anag) (5-6)