Most stylish and vacuous supermodel, I'm afraid, is in France (8)

I believe the answer is:

sleekest

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'most stylish' is the definition.
Both the answer and definition are superlative adjectives. Maybe you can see a link between them that I don't see?

'vacuous supermodel i'm afraid is in france' is the wordplay.
'vacuous' suggests removing the centre.
'i'm afraid' becomes 'eek' (expression of fear).
'is in france' becomes 'est' ('is' in French).
'supermodel' with its centre removed is 'sl'.
'sl'+'eek'+'est'='SLEEKEST'

'and' acts as a link.

Can you help me to learn more?

(Another definition for sleekest that I've seen is " Glossiest".)

I've seen this clue in The Times.

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