The most common and most likely answer to this crossword clue is the 10 letter word EVAPORATES
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The straight part
We know that "disappears" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case disappears = evaporates.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 EVAPORATES mean?
EVAPORATES verb- To transition from a liquid state into a gaseous state
- To expel moisture from (usually by means of artificial heat), leaving the solid portion
- To give vent to; to dissipate
- To disappear; to escape or pass off without effect