The most common and most likely answer to this crossword clue is the 12 letter word SEQUESTERING
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Buddy explains!
The straight part
We know that "Shutting away" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shutting away = sequestering.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 SEQUESTERING mean?
SEQUESTERING verb- To separate from all external influence; to seclude; to withdraw.
- To separate in order to store.
- To set apart; to put aside; to remove; to separate from other things.
- To prevent an ion in solution from behaving normally by forming a coordination compound
- To temporarily remove (property) from the possession of its owner and hold it as security against legal claims.
- To cause (one) to submit to the process of sequestration; to deprive (one) of one's estate, property, etc.
- To remove (certain funds) automatically from a budget.
- To seize and hold enemy property.
- To withdraw; to retire.
- To renounce (as a widow may) any concern with the estate of her husband.