The most common and most likely answer to this crossword clue is the 9 letter word VAINGLORY
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The cryptic/wordplay part
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What does VAINGLORY mean?
VAINGLORY noun- Excessive vanity.
- Boastful, unwarranted pride in one's accomplishments or qualities.
- Vain, ostentatious display.
- A regarding of oneself with undue favor.
- To boast; to act in a vain manner.