Welcome to the forum. As in the above post, it could be a lot of things. I'd suggest you jack the rear up and the car in neutral and try to turn the wheel....see if it makes a noise. If you do this make sure you put bricks or similar in front of and behind the front wheels to stop it moving and do not get under the car whilst up on the jack. Another method is to drive the car to where yopu can have one side on the footpath and the other on the road - then you get better clearance to do an inspection - but to track it down, you are going to have to look.
It may be something as simple as a pebble stuck in the rear brake. Good Luck.
"If anyone disagrees with anything I say, I am quite prepared not only to retract it, but also to deny under oath that I ever said it." --T. Lehrer
"The secret of success is sincerity. Once you can fake that you've got it made." -- Jean Giraudoux