The most common and most likely answer to this crossword clue is the 9 letter word TRIUMPHED
T
R
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D
Buddy explains!

The straight part
We know that "succeeded" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case succeeded = triumphed.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 TRIUMPHED mean?
TRIUMPHED verb- To celebrate victory with pomp; to rejoice over success; to exult in an advantage gained; to exhibit exultation.
- To prevail over rivals, challenges, or difficulties.
- To succeed, win, or attain ascendancy.
- To be prosperous; to flourish.
- To play a trump in a card game.