I fold right here. I dont think I'll get saved too much by kicker, i feel even pairing my 5 might not win the pot. Villians like looks a lot like QQ, AQ, AK. He knows you have an Ace and he doesn't care much. You say he is a major LAG but does he play well postflop? If he is a complete doofus I might call down but I would need some damn good signs to call it down.