The most common and most likely answer to this crossword clue is the 9 letter word EMPURPLED
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The straight part
We know that "Over-embellished" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case over-embellished = empurpled.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
EMPURPLED verb- To make purple.
- To enrage or anger, referring to making the face purple or red with blood.
- Of writing, to make overly flowery or showy; to embellish unduly.
- Made purple, especially having a purple complexion because of rage etc.
- (of a text) over-embellished or flowery