Wellp, I found the lack of Human Clerics disturbing, and the only two I managed to find didn't really look like the Orcs and Humans ones, as depicted in the game's manual, so, I gave it a try, and here we are.
I didn't delete the book bone just in case someone wants to merge the one from the priests or chaplains, and I may even add a 'with book' version too. I think I could make some edits here and there to make it look better, but as of now, I'd say it's pretty finished.
As you can see, it's 'just' a basic geomerge (Human Mage + Paladin) with some minor changes to the model and the textures (Priest + Human Mage + Paladin).
I may also make some tweaks to the Portrait, as it still kinda looks just like a retextured paladin head with a priest body, but not right now.
Texture paths are:
Textures\ClericOwn.blp
Textures\ClericOwnHead.blp