Crossword Genius

Topless is best of all (8)

Ross

I believe the answer is:

uncapped

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'all' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I don't see?

I don't understand the remainder of the clue.

Can you help me to learn more?

(Another definition for uncapped that I've seen is " Having no upper limit".)

I've seen this clue in the Evening Standard.
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