Crossword Genius

Battery liquid (4)

Ross

I believe the answer is:

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

This is all the clue.

(Other definitions for acid that I've seen before include "Bitter - drug" , "Drug LSD (colloq.)" , "- - -drop, sweet" , "Sour - vitriolic" , "Corrosive fluid" .)

I've seen this clue in the Penny Press, The New York Times, The Sunday Times and The Times.
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