All you know from declarers hand is 5♠s, opening strength and 1 Ace. Normally you should think long before leading out an Ace against a small slam, but with trump K, you have a good chance that declarer has the Ace of ♠.
So you lead hopefully your ♣A and get dummy ♣9 partner ♣4 and declarer ♣2.
You and your partner agreed to play standard signals.
How do you plan the defense? Which suit do you lead to trick2 and why?
Another question: If declarer leads ♠10, do you cover? What if he leads ♠J?