If clubs are 3-3, you have 12 tricks (5C, 4D, 1H, 2S). It is not required to test clubs right away of course. If clubs don't break, you are down to 10 tricks. With 10 tricks, you need some additional luck. Options include:
- hook east for spade queen and play for spades to be 3-3, but lack of re-entry to dummy prevents you from winning but 2 spades
- hook east for spade queen, and play for a squeeze of some sort, but lack of entry to dummy prevents any such squeeze to work
- play for a repeating triple squeeze
For the triple squeeze to work, the opponent with the long club could have the heart JACK and 4 spades I guess. That would give you a shot at a triple squeeze. And with long spades and long clubs, it is of course a repeating triple squeeze. But that is quite a lot to hope for. We already suspect WEST to hold heart JACK from low lead. He had 4D's, and we want him to have 4S and 4Clubs? Not possible as he already played two hearts, and needs a third. So the repeater will have to be on EAST, and the ending would look something like this.
So I guess at this point, I try clubs pitching a spade from dummy. If clubs are 3-3 home, if not, well, hopefully EAST is 4-3-2-4 with the heart jack.