SERUM

Amber-coloured fluid in the blood (5)

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

• Quick crossword No 15,974 — 2021-07-18 23:00:42
  13A: Watery component of blood (5)
• Quick crossword No 15,208 — 2019-02-04 00:00:15
  5D: Amber-coloured fluid in the blood (5)