The most common and most likely answer to this crossword clue is the 11 letter word BRIGHTENING
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Buddy explains!
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 BRIGHTENING mean?
BRIGHTENING verb- To make bright or brighter in color.
- To make illustrious, or more distinguished; to add luster or splendor to
- To make more cheerful and pleasant; to enliven
- To grow bright, or more bright in color; to clear up
- To become brighter or more cheerful in mood
- To make acute or witty; to enliven.
- An instance of becoming brighter.