No nooo please don't clip him again!

Birdies need their flight for protection..and I swear they are more social when they have their flight and can come and go and visit you when they want to.
Keet proof like Siegel suggested and Jeanne's idea of using a fav toy is a good one.

They love playing with toys WITH you.
When he does finally come to you when you call him be sure to praise him and make a huuuge deal out of it every time he comes to you when called.
If he is on top of his cage or in his cage and you ask him to step up..will he? Try staying back about a foot from him and calling to him..even just a short hop to your hand/finger, of he comes praise him. Then keep going back further and further away from him...
Be sure to call him or use whatever signal you will be using. A whistle a bell...