Crossword Genius

Son abandoning extremely cold region for a warmer one? (6)

Ross

I believe the answer is:

iberia

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'son' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for iberia that I've seen before include "Peninsula that was Roman province" , "SW European peninsula" , "European countries" , "W. European peninsula" , "Spain and Portugal - airline" .)

I've seen this clue in The Times.
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