You should have only one DHCP server and one router on your LAN.
The CPE150 modem has both, but if you need wireless, you can't use the router and DHCP functions on the CPE150 modem AND those on the wireless router.
Make a single connection from the modem to the 'Internet' (WAN) port on your wireless router. The CPE150 will assign an IP address to the WAN side of your router. (probably 192.168.15.3)
Then use your router as you always have. Most routers have a DMZ setting if you want to put your server in the wild.
I will note too that running a web server on the CLEAR service violates their Acceptable Use Policies. And the inconsistent upload speeds that are often seen with WiMAX suggests that traffic to your web server could be slow for your users. You can avoid all this by taking some of the monthly dollars you save using CLEAR vs another ISP and signing up for a hosting service like justhost.com For $3.50 a month, you can host your web site, manage your domain names, get email on any of your domain names etc. and not violate the CLEAR AUP in the process.
You can download the user manual for the CLEAR modem here:
http://www.motorola.com/Hellomoto/Master%20Lists/Product%20Manuals/Static%20Files/US-EN/CPEi150%20User%20Guide-Ver-A.pdf