The most common and most likely answer to this crossword clue is the 9 letter word DETAINERS
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Buddy explains!
The straight part
We know that "Ones responsible for imprisonment" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ones responsible for imprisonment = detainers.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 DETAINERS mean?
DETAINERS noun- The right to keep a person, or a person's goods or property, against his will. A type of custody.
- One who detains.