It depends on your Clear modem model, if it has routing capability (some do), all you need is a switch. Otherwise I would use a router, although you could use a router in AP mode if you also want a local wireless network available.
Do you have 2 ethernet plug?
If so you can do network bridging with your PC:
1.) Go to Control Panel > Network and Internet > Network Connections
2.) Plug your Blu-Ray player to your computer
3.) You should see you Blu-Ray (or etc) on the list then highlight it and the "Local area connection"
4.) Right click then select "Bridge Connections"