A guitarist’s playing for a group of stars (11)

I believe the answer is:

sagittarius

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'group of stars' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'a guitarist's playing' is the wordplay.
'playing' is an anagram indicator.
'a'+'guitarists'='aguitarists'
'aguitarists' anagrammed gives 'SAGITTARIUS'.

'for a' is the link.

Can you help me to learn more?

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

I've seen this clue in The Times.

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