The most common and most likely answer to this crossword clue is the 6 letter word SOLUTE
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More clues leading to the result SOLUTE
Buddy explains!

The straight part
We know that "One dissolved" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one dissolved = solute.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 SOLUTE mean?
SOLUTE noun- Any substance that is dissolved in a liquid solvent to create a solution
- To dissolve.
- To absolve.
- Loose; free; liberal
- Relaxed, hence, merry; cheerful
- Able to be dissolved; soluble
- Not adhering; loose; opposed to adnate