Sulphur (9)

I believe the answer is:

brimstone

'sulphur' is the definition.
(I've seen this before)

This is all the clue.

(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 Evening Standard and The Independent.

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