Could be a stuck caliper or a seized parking brake. Jack rear of the car up, and chock the front wheels. Then release the parking brake and try to spin the offending wheel. I'd then pull the brake pad clips off and see if you can squeeze the pad away from the rotor, like you would to remove the pads. If you can then it's not the caliper. If you can't then you likely have seized caliper. If you can get the pads out then try spinning the wheel again. If it's still stuck then it's probably parking brake.

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