The most common and most likely answer to this crossword clue is the 10 letter word SKYJACKING
I've seen this crossword clue in The Times
S
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Buddy explains!
The straight part
We know that "Crime at a high level" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case crime at a high level = skyjacking.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 SKYJACKING mean?
SKYJACKING verb- To steal or commandeer (hijack) an airplane, usually by threat of violence to the passengers.
- The kidnapping of the passengers of an airplane by threat of force. The hijacking of an airplane, especially in flight.