Top up the drink the freelance has (8)

I believe the answer is:

pinnacle

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'top' is the definition.
(pinnacle is a kind of top)

I can't explain the remainder of the clue.

(Other definitions for pinnacle that I've seen before include "The highest point, summit" , "Place inn on the very top" , "tip-top" , "High pointed piece of rock" , "Highest point of success" .)

I've seen this clue in the Evening Standard.

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