The most common and most likely answer to this crossword clue is the 5 letter word DRACO
D
R
A
C
O
More clues leading to the result DRACO
- Fare includes vehicle for returning group of stars
- Old knave maybe knocked back, seeing stars
- Harsh legislator sending old humorist to Heaven?
- Sort of lizard Jack maybe flipped over
- Love following e.g. Queen around – star group
- Laid-back character first to oppose man of strict judgments
- Greek lawmaker is to do without car club
- Lizard: breed shedding tail in effect?
- Famous physicist, one seen out with old group of stars
- Old character going around with some of the stars
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 = draco.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.