Praise diverse kingdom of old (6)
I believe the answer is:
persia
'kingdom of old' is the definition.
The answer and definition can be both locations as well as being singular nouns.
Perhaps there's an association between them I don't understand?
'praise diverse' is the wordplay.
'diverse' indicates anagramming the letters (diverse implies variety or a change in the letters).
'praise' is an anagram of 'PERSIA'.
Can you help me to learn more?
(Other definitions for persia that I've seen before include "Iran, formerly" , "It's now known as Iran" , "Praise be to ancient Iran" , "Former name of Iran" , "Old Iran" .)