Crossword Genius

Antiseptic solution (6)

Ross

I believe the answer is:

iodine

(Other definitions for iodine that I've seen before include "Element existing in vapour and crystalline form" , "Element, atomic number 53" , "Black crystalline element" , "Disinfectant made from seaweed" , "Halogen element, atomic no 53" .)

I've seen this clue in The Telegraph.
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