Not called upon, six relax in nude burlesque (9)

I believe the answer is:

unvisited

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'six relax in nude burlesque' is the definition.
I can't tell whether this defines the answer.

'not called' is the wordplay.
'not' becomes 'un' (prefix meaning 'not').
'called' becomes 'visited' ('visit' can be a synonym of 'call').
'un'+'visited'='UNVISITED'

'upon' acts as a link.

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I've seen this clue in the Sydney Morning Herald.

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