Possible Clues:

• Name of patriarch in a chapter in OT book
• Father of the twelve patriarchs of Israel
• South African president Zuma
• A sturdy horse carrying Jack's twin brother
• Biblical sufferer admits insomnia, finally beginning to count sheep
• Installing air conditioning is work for one man
• Biblical character's account in holy book
• One sold rights cheaply: bill's in the post
• Account penned by one biblical character -- for another?
• A son of Isaac