Discard in hand with short side suit 2

Discard in hand with short side suit 2

Q J 7 6 5
6 5
A 5 4 3
5 4
N
W   E
 
S
A K 8 4 3 2
A 4 3 2
2
3 2

Contract:

4 by South

Lead:

A

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