Losing control by unnecessary ruffing with long trumps

Losing control by unnecessary ruffing with long trumps

♠ A 5
♥ Q 6 5 4
♦ 10 5 4 3
♣ 6 4 3
N
W   E
 
S
♠ 4
♥ K J 3
♦ K Q J 6
♣ A K Q J 10

Contract:

5♣ by South

Lead:

♠K

Somehow you have ended up in the best contract. You have two missing side suit aces. Plan the play.