A good line of play and a better defense

St. Jerome wrote, "Good, better, best. Never let it rest. 'Til your good is better and your better is best."

How does that apply to this deal? What is South's good line of play in four spades after West leads an obvious singleton club? What is the better defense by East-West?

Note South's jump to four spades. When North made his takeout double, he was going to assume that South had six or seven points. South, with a trick more than that, was right to jump to game. When an opponent opens with a three-level pre-empt, then leads a different suit, that card is a singleton. (Also, Andy Robson, an English expert, advises that if the preemptor leads his own suit, assume he has a singleton in your trump suit.)