Crossword Genius

He-men at a dance outside university club in London (9)

Ross

I believe the answer is:

athenaeum

'club in london' is the definition.

'he-men at a dance outside university' is the wordplay.
'dance' is an anagram indicator.
'outside' means one lot of letters goes inside another.
'university' becomes 'u'.
'he'+'men'+'at'+'a'='hemenata'
'hemenata' anagrammed gives 'athenaem'.
'athenaem' going around 'u' is 'ATHENAEUM'.

(Another definition for athenaeum that I've seen is " London club for the learned".)

I've seen this clue in The Guardian.
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