Call me an newbie since I've never actually gotten in a fight with a high level cleric and mage but It would seem to me that if the cleric has some decent armor and weapons he could take out a mage pretty easily... if he can get close and through his protections enough to whack him with a powerful mace... he'll win.. if he can't he'll lose.
I've been playing Paladin's for years and they seem like a very powerful setup. Fighting prowess combined with cleric spells... a strong one-on-one performer. For playing solo magic users are pretty delicate beasts... until they get to the point where they can summon help.
I think it would come down to how well equipped the Cleric is... if he's fully taking advantage of the more powerful armor and weapons at his disposal a magic user would need to kill him in the first round in order to win I think... after that he'll close and start interfering with spellcasting.
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