How add this destory bullet to my autofire script?

My original shooting script was single fire only but it had a script where it deletes bullets after x amount of seconds. I have it set to 2. Here is the script that has the delete bullet thing. var projectile : Rigidbody ; var speed = 20;

 function Update () {
 
 if(Input.GetButton("Fire1"))
 {
 clone = Instantiate(projectile, transform.position, transform.rotation);
 clone.velocity = transform.TransformDirection(Vector3 (0, 0, speed));
 clone.AddForce(clone.transform.forward * 2150);
 Destroy (clone.gameObject, 2);
 
 }}

Line 11 is the line I would like to add to this script

 #pragma strict
  
 var bullet : GameObject;
 
 private var shooting = false;
  
 function Start() {
    InvokeRepeating("Shoot", 0.0, 1.0 / bulletsPerSecond);
 }
  
 function Shoot() {
   if (!shooting) return;
   var go = Instantiate(bullet, transform.position, transform.rotation);
   go.rigidbody.AddRelativeForce(Vector3.forward * 1750.0);
 }
  
 function Update(){
     shooting = false;
     if(Input.GetAxis("Fire1")){
         shooting = true;
     }
 }
 private var bulletsPerSecond = 6.0;

When I try to do this i get a compiler error saying clones is bad or something. Where do I add line 11 or whatever line to make this work?