The word clearance actually refers getting rid of old stock, usually at very reduced prices. It is closely related to the term 'on sale' and is sometimes used as 'clearance sale'. When something is 'on sale' it means the price has been reduced. However, if the owner of the store wants to get rid of old stock to make room for new stock, they will sometimes offer things 'on sale' at drastically reduced prices. We would call that a 'clearance' or 'clearance sale'.
It's common to see clearance sales during the change of seasons in clothing stores when businesses want to sell as much of one season's clothing to make room for the upcoming season's clothing. As well, you will often see stores that are going out of business have a 'clearance sale'.
'Did you hear that Morgan's Shoes is going out of business? They are having a clearance sale and everything is 70% off the original price!'
So as you can see, clearance has a very different meaning than repossession.
Hint: Be careful not to confuse 'on sale' with 'for sale'.