Italian region where lakes are less cold (6)

I believe the answer is:

umbria

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'italian region' is the definition.
(Umbria is an example)

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

(Other definitions for umbria that I've seen before include "Mountainous region in central Italy" , "hilly area of Italy" , "part of Italy" , "Italian region" , "in the Tiber region" .)

I've seen this clue in The Sunday Times and The Times.

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