So that seems to be it for the defense. 4H can make 6 tricks, but again that's not good enough. The defense starts with a diamond lead, and the finesse is taken. The diamond ace is taken, followed by two rounds of hearts and the ten of hearts.
North wins, and the defense takes their three spade tricks, north pitching clubs.
7 West can't get more than his two trump tricks, for a total of six tricks. Suppose they lead a diamond. Declarer wins, and exits a club. Another diamond, won again in the east hand. Declarer exits with the nine of spades, and south can take his diamonds but eventually must give up a trick to the spade suit.