The most common and most likely answer to this crossword clue is the 10 letter word CONSTITUTE
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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.
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What does CONSTITUTE mean?
CONSTITUTE noun- An established law.
- To set up; to establish; to enact.
- To make up; to compose; to form.
- To appoint, depute, or elect to an office; to make and empower.