since many people (including me) had problems seeing the USB install option for High Sierra 13.10.2, I finally found the solution/issue.
The problem is the latest High Sierra app (10.13.2) provided by apple. For some reason clover doesn't recognize it... But I searched and found the 10.13.1 version, installed everything as mentioned in the Clover guide and did a complete clean install of High Sierra with no issues!
I hope that this information will help you! Maybe the Clover guys have a solution to fix this and get clover work with 10.13.2!