audio clip not working

Scripting
1 
using UnityEngine;
using System.Collections;

public class firebreathing : MonoBehaviour {

    public ParticleSystem firebreath;
    public GameObject pointlight;
    public BoxCollider fire;
    public AudioClip sizzle;

    void Start(){
        firebreath.GetComponent<ParticleSystem> ().enableEmission = false;
        pointlight.active = false;
        fire.enabled = false;


    }
    void Update () {
        if(Input.GetKey(KeyCode.Mouse0)){
            firebreath.GetComponent<ParticleSystem>().enableEmission = true;
            pointlight.active = true;
            fire.enabled = true;
            GetComponent<AudioSource>().clip = sizzle;
            GetComponent<AudioSource>().Play();
        }
        else if(Input.GetKeyUp(KeyCode.Mouse0)){
            firebreath.GetComponent<ParticleSystem>().enableEmission = false;
            pointlight.active = false;
            fire.enabled = false;
            GetComponent<AudioSource>().Stop();
        }
    }
}
2

You forgot to write down what you want, and your problem