Been doing some research and cannot find anything solid.
Does a cleric with a high wisdom get a bonus domain spell?
Or is the domain spell not not included in bonus spell casting...
Your high wisdom does give you an extra spell per day but it is not an extra domain slot.
You can also cast your domain spells a second time by useing a pearl of power to get the slot back. Useful when you have a domain spell that is not part of the regular cleric spell list.