The most common and most likely answer to this crossword clue is the 9 letter word APPALLING
I've seen this crossword clue in The Times
A
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More clues leading to the result APPALLING
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 = appalling.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 APPALLING mean?
APPALLING verb- To fill with horror; to dismay.
- To make pale; to blanch.
- To weaken; to reduce in strength
- To grow faint; to become weak; to become dismayed or discouraged.
- To lose flavour or become stale.
- Horrifying and astonishing.
- Extremely bad; terrible