The most common and most likely answer to this crossword clue is the 10 letter word PERIPETEIA
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Buddy explains!
The straight part
We know that "Sophocles’ swift swing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sophocles’ swift swing = peripeteia.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 PERIPETEIA mean?
PERIPETEIA noun- A sudden reversal of fortune as a plot point in Classical tragedy.
- (by extension) Any sudden change in circumstances; a crisis.
- A turning point in psychosocial development.