Cryptic crossword clue
Salt, or in water perhaps, alkaline base 8

The most common and most likely answer to this crossword clue is the 8 letter word FLUORIDE

I've seen this crossword clue in The Guardian
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Buddy explains!

The straight part
We know that "Salt" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case salt = fluoride.
The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.
This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.

What does FLUORIDE mean?

FLUORIDE noun
  1. Any salt of hydrofluoric acid; for example, potassium fluoride.
  2. A binary compound of fluorine and another element or radical.

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