Are you sure declarer has played low ♣ at Trick 3? Assuming yes think impossible to play anything other than spade ace at trick 5. But this can be set .West at trick 3 simply has to play ♣8 not the ace:) Once ♣8 wins cash ♣ace .East signals something in ♠. The west continues ♠. Now we know defense is easy when declarer shows out. If declarer has played ♣ 9 at trick 3 i dont think it is possible to set this unless I can see all 4 hands:) By the way on ♦ lead this might go down since declarer has to make a right guess in ♣ :)