Crossword Genius

Battery fluid (4)

Ross

I believe the answer is:

acid

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">battery fluid</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>

(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 Sun, the USA Today, the King Feature Syndicate, the Penny Press and the LA Times.
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