Mincemeat Peter finds neither hot nor cold (9)

I believe the answer is:

temperate

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

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for temperate that I've seen before include "pleasant" , "With mild climate" , "Abstemious" , "Showing self-restraint" , "Calm" .)

I've seen this clue in The Globe and Mail.

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