Possible Clues:

• Capital city of Ghana
• City of gold, according to the Sun
• Home town of Ghanaian Michael Essien
• Twin Cities captured by first-rate artist? That's capital
• City of Ghana
• How capital to give small measure to the Academician!
• The accountant with a broken-down car in Africa
• One millilitre with the artist in Africa? That's capital!
• Port - a little drop given to Rear Admiral
• Capital increasing through interest that's cut by half on the first of April