Cryptic crossword clue
Without improvement, varying sea level rises into crumbling dune 8

The most common and most likely answer to this crossword clue is the 8 letter word UNEDITED

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

The straight part
We know that "Without improvement" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case without improvement = unedited.
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 UNEDITED mean?

UNEDITED adjective
  1. Not having been altered from the original version; not edited.

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