Almost Lightner, declarer steals a six spot winner

On the following deal, when they landed in 5 Clubs after a competitive auction, partner showing the majors, I almost made a lightner double. I wonder if partner would have duly led a spade for me to put him in with a H and to collect a second spade ruff? However, as things unfolded, partner got off to a H lead, now we could not get three off the top, he shifted to a diamomd, my King and declarer's Ace. Declarer after drawing trump in three rounds ending in hand, advanced the Spade 6 and when partner drowsily played small, played the five from dummy! the trick had been six, four, five, and I was void in the suit! Now he made 12 tricks easily. Note the play if North covers. Declarer must now duck in dummy and leave north on play. He should finish the last two trump in dummy, and then the diamond finesse of the ten and the DQ is the squeeze card. North is squeezed between S:KJ and H:Q, dummy having S:Ax and declarer S:x H:Q