The most common and most likely answer to this crossword clue is the 11 letter word CRUCIFIXION
I've seen this crossword clue in Financial Times
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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 CRUCIFIXION mean?
CRUCIFIXION noun- An execution by being nailed or tied to an upright cross and left to hang there until dead.
- The military punishment of being tied to a fixed object, often with the limbs in a stretched position.
- An ordeal, terrible, especially malicious treatment imposed upon someone.