The most common and most likely answer to this crossword clue is the 11 letter word EMBELLISHED
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Buddy explains!

The straight part
We know that "with decorations" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case with decorations = embellished.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 EMBELLISHED mean?
EMBELLISHED verb- To make more beautiful and attractive; to decorate.
- To make something sound or look better or more acceptable than it is in reality; to distort, to embroider.
- Having been made more attractive, compelling or interesting.