One of those from Georgia, Trim and one side of the Urals (4)
I believe the answer is:
asia
'one' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for asia that I've seen before include "huge territory" , "Continent bordering three oceans" , "Earth's largest continent" , "Continent of the Hindu Kush" , "The Orient" .)