Making a simple ticking clock in AS3 with .as files

Question

I'm making a simple clock in AS3 as seen on youtube (Doug Winnie) but I want to put the code into separate .as files. This is what I have so far but I keep getting the error 1046: Type was not found or was not a compile time constant: secondHand. But it's saying that the location of the error is Line 3 of Clock, but secondHand isn't even mentioned here?
package  {
import flash.display.MovieClip;
public class Clock extends MovieClip {
import flash.events.TimerEvent;
import flash.utils.Timer;
import flash.events.MouseEvent;
var clockTimer:Timer = new Timer(1000, 60);
    public function Clock(e:TimerEvent):void
        clockTimer.addEventListener(TimerEvent.TIMER_COMPLETE, endTimer);
        function endTimer(e: TimerEvent): void
        trace("Finished");
// startButton and stopBtn are instances of GameButton.
package  {
import flash.display.MovieClip;
import flash.events.MouseEvent;
public class GameButton extends MovieClip {
    public var startButton : GameButton;
    public var stopBtn : GameButton;
    public function GameButton():void
    createListener();
    startButton.buttonLabel.text = "Start";
    stopBtn.buttonLabel.text = "Stop";
    public function createListener():void{
        startButton.addEventListener(MouseEvent.CLICK, startTimer);
        stopBtn.addEventListener(MouseEvent.CLICK, stopTimer);
    function startTimer(e:MouseEvent):void
            clockTimer.start();
            trace ("Timer started.");
            startButton.visible = false;
        function stopTimer(e:MouseEvent):void
            clockTimer.stop();
            trace("Timer stopped.");
            startButton.visible = true;
package  {
import flash.display.MovieClip;
import flash.events.TimerEvent;
public class secondHand extends MovieClip {
    public function secondHand(e: TimerEvent):void {
        // constructor code
        clockTimer.addEventListener(TimerEvent.TIMER, moveHand);
    public function moveHand(e:TimerEvent):String
        secondHand.rotation = secondHand.rotation + 6;
        trace("timer");

Answer 1

C:\Users\Claire\Desktop\CLOCK\secondHand.as, Line 8
1018: Duplicate class definition: secondHand.
C:\Users\Claire\Desktop\CLOCK\Clock.as, Line 1
5000: The class 'Clock' must subclass 'flash.display.MovieClip' since it is linked to a library symbol of that type.
C:\Users\Claire\Desktop\CLOCK\GameButton.as, Line 1
5000: The class 'GameButton' must subclass 'flash.display.MovieClip' since it is linked to a library symbol of that type.
C:\Users\Claire\Desktop\CLOCK\secondHand.as, Line 1
5000: The class 'secondHand' must subclass 'flash.display.MovieClip' since it is linked to a library symbol of that type.