Figure on the invoice for Pinot from mountaintop (6)

I believe the answer is:

amount

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'figure' is the definition.
(thesaurus)

I don't understand the remainder of the clue.

(Other definitions for amount that I've seen before include "Sum of money" , "A quantity or total of anything" , "value" , "Measure, quantity" , "Size" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.

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