The most common and most likely answer to this crossword clue is the 10 letter word CENTENNIAL
I've seen this crossword clue in The Guardian
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More clues leading to the result CENTENNIAL
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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.
What does CENTENNIAL mean?
CENTENNIAL noun- The hundredth anniversary of an event or happening.
- Relating to, or associated with, the commemoration of an event that happened a hundred years before.
- Happening once in a hundred years.
- Lasting or aged a hundred years.