Region in South Africa — or region of ancient Greece (6)
I believe the answer is:
sparta
'region of ancient greece' is the definition.
'Sparta' can be an answer for 'region' (Sparta is an example). I am unsure of the 'of ancient greece' bit.
'region in south africa' is the wordplay.
'region' becomes 'part' (synonyms).
'in' indicates putting letters inside.
'south africa' becomes 'SA' (abbreviation).
'part' going within 'sa' is 'SPARTA'.
'or' acts as a link.
Can you help me to learn more?
(Other definitions for sparta that I've seen before include "Ancient Greek city state" , "Laconic state" , "Ancient Greek city, capital of Laconia" , "Ancient country" , "Ancient Greek city noted for its austerity" .)