Attractive individuals performing for audience (7-2)

I believe the answer is:

lookers-on

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'attractive individuals performing for audience' is the definition.
I can't tell whether this definition defines the answer.

'attractive individuals performing' is the wordplay.
'attractive individuals' becomes 'lookers' (looker is a kind of individual. I am not sure about the 'attractive' bit.).
'performing' becomes 'on' (as in being on stage).
'lookers'+'on'='LOOKERS-ON'

Can you help me to learn more?

(Another definition for lookers-on that I've seen is " Witnesses".)

I've seen this clue in The Independent.

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