The most common and most likely answer to this crossword clue is the 13 letter word INCARCERATION
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Buddy explains!
The straight part
We know that "state of confinement" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case state of confinement = incarceration.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 INCARCERATION mean?
INCARCERATION noun- The act of confining, or the state of being confined; imprisonment.
- Strangulation, as in hernia.
- A constriction of the hernial sac, rendering it irreducible, but not great enough to cause strangulation.