The most common and most likely answer to this crossword clue is the 9 letter word PENTAGRAM
I've seen this crossword clue in The Guardian
P
E
N
T
A
G
R
A
M
More clues leading to the result PENTAGRAM
- Star to write signature and stuff
- Star shape to identify sheep behind fold
- Star cooped up, putting on some weight
- Another pagan term?
- Star, confined, gaining little weight
- One writing piece about male star
- Emin’s back in seaside town, quiet retiring star!
- Manger apt to be shown transformed by star
- Repressed memory restricting limits of acting star
- Star name prodding female and male animals
Buddy explains!

The straight part
We know that "star" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case star = pentagram.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 PENTAGRAM mean?
PENTAGRAM noun- The shape of a five-pointed star constructed of five intersecting lines meeting at the vertices, such that a central pentagon and five surrounding isosceles triangles are formed; often with magical connotations; a 5/2 (or 5/3) star polygon.