Possible Clues:

• Stumble over the oil in Africa
• Capital excursion round the Italian retreats
• Where one might stumble on oil mixed in north Africa (7)
• African capital said to give you threefold ecstasy!
• Capital on the Mediterranean Sea
• Slip on spilt oil in Middle East port
• Where abroad one might begin to fall over the oil
• Where you're liable to fall over the oil mixture
• Stumble on oil accidentally in African city
• Oil changes after journey to see African city