The most common and most likely answer to this crossword clue is the 8 letter word FLOCCULI
F
L
O
C
C
U
L
I
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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 FLOCCULI mean?
FLOCCULI noun- A small fluffy tuft.
- Either of two small lobes on the posterior border of the cerebellum.
- A marking on the surface of the sun associated with a solar prominence.