A clean installation will clean the partition, and provide a fresh installation on the system.
Installation (or setup) of a computer program (including device drivers and plugins), is the act of making the program ready for execution. Because the process varies for each program and each computer, programs (including operating systems) often come with an installer, a specialized program responsible for doing whatever is needed (see below) for their installation. Installation may be part of a larger software deployment process.
Installation typically involves code (program) being copied/generated from the installation …