Corrosive mixture (4,5)
I believe the answer is:
aqua regia
'corrosive mixture' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for aqua regia that I've seen before include "Nitrohydrochloric acid dissolving gold" , "Corrosive mixture" .)
I've seen this clue in The Independent.
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