The most common and most likely answer to this crossword clue is the 13 letter word PRECIPITATION
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result PRECIPITATION
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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 PRECIPITATION mean?
PRECIPITATION noun- Any or all of the forms of water particles, whether liquid or solid, that fall from the atmosphere (e.g., rain, hail, snow or sleet). It is a major class of hydrometeor, but it is distinguished from cloud, fog, dew, rime, frost, etc., in that it must fall. It is distinguished from cloud and virga in that it must reach the ground.
- A hurried headlong fall.
- A reaction that leads to the formation of a heavier solid in a lighter liquid; the precipitate so formed at the bottom of the container.
- Unwise or rash rapidity; sudden haste.