The most common and most likely answer to this crossword clue is the 9 letter word LIGHTNESS
I've seen this crossword clue in Independent
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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 LIGHTNESS mean?
LIGHTNESS noun- The condition of being illuminated
- The relative whiteness or transparency of a colour
- The product of being illuminated.
- The state of having little weight, or little force.
- Agility of movement.
- Freedom from worry.
- Levity, frivolity; inconsistency.