The most common and most likely answer to this crossword clue is the 11 letter word METEOROLOGY
I've seen this crossword clue in The Daily Telegraph
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More clues leading to the result METEOROLOGY
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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 METEOROLOGY mean?
METEOROLOGY noun- The science that deals with the study of the atmosphere and its phenomena, especially with weather and weather forecasting.
- The atmospheric phenomena in a specific region or period.