Not an acid (6)

I believe the answer is:

alkali

(Other definitions for alkali that I've seen before include "Non-acid" , "Acid neutraliser" , "Acid-neutralising substance" , "base solution" , "In pH terms, not acid" .)

I've seen this clue in The Sun.

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.