Crossword Genius

Halogen element (6)

Ross

I believe the answer is:

iodine

(Other definitions for iodine that I've seen before include "Solution applied to wounds as an antiseptic" , "Dark-violet antiseptic" , "Infamous tablets in case of a nuclear emergency" , "Black crystalline element" , "Nonmetallic element in seaweed" .)

I've seen this clue in The Times.
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