The most common and most likely answer to this crossword clue is the 8 letter word LUCIDITY
I've seen this crossword clue in The Times
L
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D
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More clues leading to the result LUCIDITY
- Girl retaining identity: it shows clear headedness
- Soundness I'd found in large university, Oxford for one
- Clarity of blue, essentially without a sharpness
- Clear thinking with good fortune capturing thicko with no love for king
- Transparency of woman hugging loveless idiot
- Coherent quality in broadcast I idly cut
- Coherence: I had it in character on a 1950s show
Buddy explains!
The straight part
We know that "Soundness" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case soundness = lucidity.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 LUCIDITY mean?
LUCIDITY noun- The property of being lucid, lucidness.
- The state of being aware that one is dreaming, i.e. being in a lucid dream.