The most common and most likely answer to this crossword clue is the 10 letter word RIDICULOUS
I've seen this crossword clue in The Guardian
R
I
D
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C
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S
More clues leading to the result RIDICULOUS
- Ludicrous? I could be re-interpreted as this
- Absurd for setter to get drawn into ludicrous muddle
- Absurd religious class explicit about ordinary American
- Clear backing to enter Brazilian city to reach America is absurd
- Absurd and sadly ludicrous one should wear that
- Urdu coil is affected and frankly laughable
- Is our arrangement to have retired brilliant or stupid?
- Small-state Conservative & Unionist is loud, wildly entertaining and crazy
Buddy explains!

The straight part
We know that "Absurd" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case absurd = ridiculous.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 RIDICULOUS mean?
RIDICULOUS adjective- Deserving of ridicule; foolish; absurd.
- Astonishing; unbelievable.