Crossword Genius

Sulphur (9)

Ross

I believe the answer is:

brimstone

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sulphur</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(Other definitions for brimstone that I've seen before include "Fire partner" , "Sulphur; butterfly" , "Old name for sulphur" , "Sulphur (when associated with hellfire)" , "hellish punishment" .)

I've seen this clue in The Independent and the Evening Standard.
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