The most common and most likely answer to this crossword clue is the 12 letter word OVER-THE-TOP
I've seen this crossword clue in The Times
O
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T
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More clues leading to the result OVER-THE-TOP
- Outrageous location of circus banner?
- Obvious hope is misplaced about leader of Tories? It’s excessive
- Evident male head becoming excessive
- Too much to hope broadcast will include Green
- What potty contains is a little extreme
- Unreasonable way to reach the next valley?
- Open rave featuring electronic rhythms essentially is outrageous
Buddy explains!

The straight part
We know that "Outrageous/location of circus banner?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case outrageous/location of circus banner? = over-the-top.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 OVER-THE-TOP mean?
OVER-THE-TOP adjective- Bold; beyond normal, expected, or reasonable limits; outrageous.
- (communications) Delivered across the Internet to a television or similar device.