The most common and most likely answer to this crossword clue is the 6 letter word GEMINI
I've seen this crossword clue in The Guardian
G
E
M
I
N
I
More clues leading to the result GEMINI
- A house and a car for one turning heads
- House of stone in India
- Sign gear half gone on little motor
- Twins, perhaps, diamond in one
- Soldier carrying artist’s sign
- Stars for example jet over island province
- Star group from, perhaps, Emerald Isle? Part of it
- Sign, say, over vehicle
- Sign of stone in Italy
- Body removed from grave? Little sign
Buddy explains!
The straight part
We know that "Star group" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case star group = gemini.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.