Icon for Click Movement

Hello, I am having a issue on creating a "target" icon in third person view, on where the mouse is clicked, and having it relocate when I click another position, when I click, or when the player uses keyboard/controller movement it vanishes.

The ISSUE is I've tried using Instantiate(), however that creates multiple objects. And I've tried using Destroy() and DestroyImmediate(), but when I click again Unity says the Object is well destroyed.

Thank You in advance, and if this is a duplicate question, let me know and give a working link. Everything I've searched for has brought up the Instantiate(), Destory() items.

This is my current code:

         if ( (Input.GetMouseButtonDown(0) && GUIUtility.hotControl ==0) ||  
              (Input.GetMouseButton(0) && GUIUtility.hotControl ==0) 
            )
         {
             Plane playerPlane = new Plane(Vector3.up, transform.position);
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             float hitdist = 0.0f;
 
             if (playerPlane.Raycast(ray, out hitdist)) 
             {
                 Vector3 targetPoint = ray.GetPoint(hitdist);
                 destinationPosition = ray.GetPoint(hitdist);
 
                 Quaternion targetRotation = Quaternion.LookRotation(targetPoint - transform.position);
                 transform.rotation = targetRotation;
 
                 //Instantiate (goalPath, destinationPosition, transform.rotation);
 
 //                if (goalPath) // Test to see if marker exsists
 //                {
 //                    Destroy(goalPath); //Destory it now
 //                    Instantiate (goalPath, destinationPosition, transform.rotation); //make new
 //                }
 //                else { Instantiate (goalPath, destinationPosition, transform.rotation); } //make new
             }
         }