The most common and most likely answer to this crossword clue is the 9 letter word TRIQUETRA
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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.
Crossword Answer definitions
TRIQUETRA noun- A shape formed of three vesica piscis, sometimes with an additional circle, a symbol of things and persons that are threefold (including the Christian Trinity), and a symbol of protection in Wicca.