CHA is critically important to charm duration along with level and MR. For this reason you should not bother charming whites/yellows and should always use tash. It is cheap and lasts longer than your charm will. As others have indicated, healing pet is grossly inefficient until ch. Cleric's role is primarily to root and then heal chanter when they mess up. Beyond that cleric can do whatever they want. As chanter levels and starts buffing/keeping pets longer, the cleric's stuns will be helpful for controlled breaks and ensuring the mob doesn't eat the chanter's face before they regain control.
I've always viewed an enchanter as someone of an insurance policy for groups (they contribute much more, but there greatest value is in mitigating oopsies ^^) I'm this duo, the cleric is an insurance policy for the chanter ^^
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