The most common and most likely answer to this crossword clue is the 8 letter word PENTACLE
I've seen this crossword clue in The Daily Telegraph
P
E
N
T
A
C
L
E
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 = pentacle.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 PENTACLE mean?
PENTACLE noun- A flat talisman, almost always disk-shaped, made of parchment, sheet metal, or other substance, marked with a magic symbol or symbols, used in magical evocation.
- A pentagram, or a disk with a pentagram on it, especially one that is used for magical or mystical purposes.
- A circumscribed pentagram.
- A figure formed by two equilateral triangles intersecting regularly so as to form a six-pointed star.