Vast region, area is spread round capital in Uzbekistan (7)
I believe the answer is:
eurasia
'vast region' is the definition.
The definition and answer can be both locations as well as being singular nouns.
Maybe you can see a link between them that I don't see?
'area is spread round capital in uzbekistan' is the wordplay.
'spread' indicates an anagram.
'round' is an insertion indicator.
'capital in' indicates taking the first letters.
The initial letter of 'uzbekistan' is 'u'.
'area'+'is'='areais'
'areais' anagrammed gives 'erasia'.
'erasia' placed around 'u' is 'EURASIA'.
Can you help me to learn more?
(Other definitions for eurasia that I've seen before include "Unbroken landmass bearing two continents" , "World's largest land mass" , "Huge area" , "Supercontinent" , "Two continents, considered as a whole" .)