POTASH

Salt used in fertilisers — hot spa (anag) (6)

Solution has appeared in 2 crosswords (2 across and 0 down):

• Quick crossword No 15,965 — 2021-07-07 23:00:45
  14A: Chemical compound used as fertiliser (6)
• Quick crossword No 15,839 — 2021-02-11 00:00:56
  14A: Salt used in fertilisers — hot spa (anag) (6)