Guitarists and a rock star group (11)

I believe the answer is:

sagittarius

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'star group' is the definition.
The answer and definition can be both natural objects as well as being singular nouns.
Perhaps you can see an association between them that I can't see?

'guitarists and a rock' is the wordplay.
'and' means one lot of letters go next to another.
'rock' is an anagram indicator.
'guitarists'+'a'='guitaristsa'
'guitaristsa' is an anagram of 'SAGITTARIUS'.

Can you help me to learn more?

(Other definitions for sagittarius that I've seen before include "Nov-Dec zodiac sign" , "Heavenly archer" , "Zodiac constellation" , "house" .)

I've seen this clue in The Guardian.

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