Crossword Genius

One could have groupies excluded from audition (4)

Ross

I believe the answer is:

band

I'm a little stuck... Click here to teach me more about this clue!

'audition' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'one could have groupies excluded' is the wordplay.
I cannot quite see how this works, but
'one' could be 'an' (an apple is one apple) and 'an' is present in the answer.
This explanation may well be incorrect...

'from' is the link.

Can you help me to learn more?

(Other definitions for band that I've seen before include "Orchestra" , "See 23" , "Capital of Tibet" , "troop" , "Outline drawing" .)

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