You and your partner were exuberant in the bidding, but you are not down yet.
Lead is the ♦8. You win the ace and play a club to your K which holds.
Now what?
Note: I assume you will have some problems with the bidding, but it is included for whatever inferences you want to take from the defense.

Help

(P) - 1♥ - (3♦) - 4♣
(P) - 4♥ - (P) - 4♠
(P) - 5♣ - (P) - 5NT
(P) - 6♣ - All Pass