Restoring from a clone is basically cloning in the opposite direction – from the backup to your original disk. Being a copy of your original disk, the clone should be bootable.
To restore:
Boot from the clone. This should let you run Get Backup and Disk Utility.
Prepare the disk or volume you want to restore to (destination).
Make sure that you copied all files you want to keep to another storage because restoring will remove everything from your destination disk volume.
Make sure that the destination disk is formatted to APFS (your clone must have APFS in this case), or Mac OS Extended (Journaled). It is recommended that you format it now to ensure that there are no errors in the file system.
Open Get Backup and close all other programs. Select the clone (volume from which you have booted) as the source, and the prepared disk as the destination. Start the cloning process.