Cannot always gain a trick

Cannot always gain a trick

♠ Q J 7 6 5
♥ A K 6 5
♦ 5 4
♣ 5 4
N
W   E
 
S
♠ A K 8 4 3
♥ 4 3
♦ A K 6 3
♣ 3 2

Contract:

4♠ by South

Lead:

♣K

West starts with two high clubs, but misreads partner's signals and leads another club. How do we take advantage?