I'm hoping that you mean you would like to control a movieclip with a keyboard button instead of the other way around.
In this case, what you need is a keyboard listener on your movieclip.
first you add the listener and pass in the name of the handler you will write
then, you write the handler and you're good to go.
if(event.keycode == 86) //looking for a 'v' button to be pressed
//do awesome stuff here!!