Cockney, aroused, loosened one end of nightgown (9)

I believe the answer is:

londonese

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'cockney' is the definition.
Both the answer and definition are singular nouns.
Perhaps you can see a link between them that I can't see?

'aroused loosened one end of nightgown' is the wordplay.
'aroused' is an anagram indicator (letters roused or stirred up into a new form).
'one end of' indicates taking the first letters.
The first letter of 'nightgown' is 'n'.
'loosened'+'n'='loosenedn'
'loosenedn' is an anagram of 'LONDONESE'.

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I've seen this clue in The Independent.

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