Alpha female snorts coke of high quality (3-5)

I believe the answer is:

top-class

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'alpha female snorts coke' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.

'high quality' is the wordplay.
'high' becomes 'top' (associated in meaning).
'quality' becomes 'class' (class is a kind of quality).
'top'+'class'='TOP-CLASS'

'of' is the link.

Can you help me to learn more?

I've seen this clue in The Independent.

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