If using ulx, grant your protected group "ulx noclip" access.
If not, and you simply have a protected group in your gmod/settings/users.txt
Uclip 1.2, line 31 of sh_uclip.lua
Old -
elseif ply:IsAdmin() or ply:IsSuperAdmin() then
Change to
elseif ply:IsAdmin() or ply:IsSuperAdmin() or ply:IsUserGroup("protected") then
If you're not using ULib, and that line isn't working for you, then whatever you are using isn't using normal Gmod group checking.
If you are using ULib/ulx, and that doesn't work for you, please return to us with a "ulx debuginfo" file attached to your next post, run from the server console while a protected group player is connected to the server.