The most common and most likely answer to this crossword clue is the 9 letter word OXYMORONS
I've seen this crossword clue in The Times
O
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More clues leading to the result OXYMORONS
Buddy explains!
The straight part
We know that "ridiculous things" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ridiculous things = oxymorons.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 OXYMORONS mean?
OXYMORONS noun- A figure of speech in which two words or phrases with opposing meanings are used together intentionally for effect.
- (sometimes proscribed) A contradiction in terms.