Cryptic crossword clue
Warning from drivers: stop growth of planes etc 11

The most common and most likely answer to this crossword clue is the 11 letter word FORESTATION

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

The straight part
We know that "growth of planes etc" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case growth of planes etc = forestation.
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.

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