Not bad figures (4)

I believe the answer is:

mild

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'not bad' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for mild that I've seen before include "Moderate, temperate" , "Meek" , "Moderately warm - type of beer" , "Gentle - bland" , "Clement -- type of beer" .)

I've seen this clue in the Evening Standard.

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