Cryptic crossword clue
Diverse bunch messed about on mattress 10

The most common and most likely answer to this crossword clue is the 10 letter word ASSORTMENT

I've seen this crossword clue in Financial Times
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Buddy explains!

The straight part
We know that "Diverse bunch" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case diverse bunch = assortment.
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 ASSORTMENT mean?

ASSORTMENT noun
  1. A collection of varying but related items.

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