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Refurbishment of loos etc, most sophisticated (7)

Ross

I believe the answer is:

coolest

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'most sophisticated' is the definition.
Both the definition and answer are superlative adjectives. Perhaps they are linked in a way I don't understand?

'refurbishment of loos etc' is the wordplay.
'refurbishment of' indicates an anagram.
'loos'+'etc'='loosetc'
'loosetc' is an anagram of 'COOLEST'.

Can you help me to learn more?

(Another definition for coolest that I've seen is " Most impudent".)

I've seen this clue in The Telegraph.
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