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Corrosive substance (4)

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4

6*

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

This is all the clue.

(Other definitions for acid that I've seen before include "Corrosive fluid" , "Corrosive substance" , "See 4 Across" , "Substance with pH of less than 7" , "Bitter; biting" .)

I've seen this clue in The Times, The Star Tribune, The Mirror, the USA Today, the Universal and the Evening Standard.
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