Cryptic crossword clue
Yield malevolent creature nabbed by agents over suffering at high levels 10

The most common and most likely answer to this crossword clue is the 10 letter word ACROPHOBIC

I've seen this crossword clue in The Times
A
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The straight part
We know that "suffering at high levels" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case suffering at high levels = acrophobic.
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.

Crossword Answer definitions

ACROPHOBIC noun
  1. A person who has acrophobia.
ACROPHOBIC adjective
  1. Of or pertaining to or suffering from acrophobia

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