Crossword Genius

Sour substance (4)

Ross

I believe the answer is:

acid

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">sour substance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for acid that I've seen before include "Substance with pH of less than 7" , "Caustic and biting" , "Acerbic" , "- - -drop, sweet" , "Substance which turns litmus red" .)

I've seen this clue in the Penny Press and the Sydney Morning Herald.
Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.