Ancient kingdom of ancient founder rising (5)
I believe the answer is:
sumer
This clue might be a double definition.
'ancient kingdom' is the first definition.
The definition suggests a singular noun which matches the answer.
'ancient founder rising' is the second definition.
The definition suggests a singular noun which matches the answer.
'of' is the link.
Can you help me to learn more?
(Other definitions for sumer that I've seen before include "Ancient region" , "site of ancient civilization" , "old region of Mesopotamia" , "old civilisation" .)