To use clone tool inside modeler
Multiply > Modeler > Duplicate > clone or press shift (v)
If you wish to use the Clone tool inside the modeler, first you need to go to the Multiply menu and choose the Modeler option. After that, just select the Clone option under the Duplicate or press shift (v) to select mirror tool. This tool has the same function with mirror, but it only clone the object on its position.
On clone panel, you can manually set the setting before cloning.