High on quality controlled capsule (7)

I believe the answer is:

upscale

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'high' is the definition.
Both the definition and answer are adjectives. Maybe there's an association between them I don't understand?

'quality controlled capsule' is the wordplay.
'capsule' anagrams to 'UPSCALE'.
However, I am unsure how the anagram is indicated.

'on' acts as a link.

Can you help me to learn more?

(Another definition for upscale that I've seen is " Prestigious".)

I've seen this clue in the Sydney Morning Herald.

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