The most common and most likely answer to this crossword clue is the 9 letter word HEXAGRAMS
I've seen this crossword clue in The Guardian
H
E
X
A
G
R
A
M
S
Buddy explains!
The straight part
We know that "Stars" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case stars = hexagrams.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 HEXAGRAMS mean?
HEXAGRAMS noun- A hollow six-pointed star formed by overlapping two equilateral triangles.
- Any of the 64 sets of solid and broken lines, formed by pairs of trigrams, used for divination in the I Ching.
- A large silver coin minted during the Byzantine Empire.