To completely empty
We had to clear out the attic so the guest could sleep there.
To rob or steal from (someone).
Kelly disappeared last night, and she cleared me out.
To be victorious in gambling against (someone).
I don't have any money, Betty cleared me out.
To remove or eject (from), especially forcibly
The police cleared the crowd out of the street to investigate the accident.
To leave quickly
They cleared out as soon as the cops arrived.
To become empty
The town is packed in the summer, but clears out in the winter.