The most common and most likely answer to this crossword clue is the 11 letter word EXTRAVAGANT
I've seen this crossword clue in The Times
E
X
T
R
A
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G
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More clues leading to the result EXTRAVAGANT
Buddy explains!

The straight part
We know that "Outrageous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case outrageous = extravagant.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 EXTRAVAGANT mean?
EXTRAVAGANT adjective- Exceeding the bounds of something; roving; hence, foreign.
- Extreme; wild; excessive; unrestrained.
- Exorbitant.
- Profuse in expenditure; prodigal; wasteful.