Greek character revised ideas and renamed country (8)
I believe the answer is:
rhodesia
'country' is the definition.
(I have seen 'old country' mean 'rhodesia' so perhaps 'country' could also mean 'rhodesia')
'greek character revised ideas' is the wordplay.
'greek character' becomes 'rho' (letter from the Greek alphabet).
'revised' indicates an anagram.
'ideas' with letters rearranged gives 'desia'.
'rho'+'desia'='RHODESIA'
'and renamed' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for rhodesia that I've seen before include "Former name for today's Zambia and Zimbabwe combined" , "country that declared independence" , "Salisbury was its capital" , "Former African country" , "Zimbabwe, formerly" .)