Crossword Genius

Sulphur, key preservative (4)

Ross

I believe the answer is:

salt

'preservative' is the definition.
(I've seen this in another clue)

'sulphur key' is the wordplay.
'sulphur' becomes 'S' (synonyms).
'key' becomes 'alt' (the Alt keyboard button).
's'+'alt'='SALT'

(Other definitions for salt that I've seen before include "Mariner; sodium chloride" , "Condiment - experienced sailor" , "A defence against ice" , "Seasoning; old sailor" , "dry wit" .)

I've seen this clue in The Times.
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