Battery fluid (4)

I believe the answer is:

acid

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

This is all the clue.

(Other definitions for acid that I've seen before include "Polluted precipitation" , "Etcher's fluid" , "Sour-tasting" , "Corrosive liquid; drug" , "Bitter or sour" .)

I've seen this clue in the King Feature Syndicate, the Penny Press, the LA Times, The Sun and the USA Today.

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