The most common and most likely answer to this crossword clue is the 10 letter word ANNULMENTS
I've seen this crossword clue in The Guardian
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Buddy explains!
The straight part
We know that "More than one quashing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more than one quashing = annulments.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 ANNULMENTS mean?
ANNULMENTS noun- An act or instance of annulling.
- The state of having been annulled.
- An invalidation of something, especially a legal contract.
- A legal (notably judicial) declaration that a marriage is invalid; the procedure leading to it.
- Total destruction.