Clarendon font is considered as the graceful and classic typeface that is required by design to be more prominent and this modern typeface is used in many different designs.
The list of projects in which this font can be used contains banners, making posters, official and unofficial documentation, greeting and wedding cards, website headers and footers, and more.
You are bound inside license restriction for any type of commercial usage through this typeface but this is free for personal usage.
If you looking for the free version of this typeface then just scroll down and hit the download button use that only for personal usage.