Can discard after drawing trumps

Can discard after drawing trumps

♠ Q 9 5
♥ A 3
♦ K J 6 5 2
♣ 8 4 3
N
W   E
 
S
♠ A K 4 3 2
♥ K 9 5
♦ Q 7
♣ Q J 10

Contract:

4♠ by South

Lead:

♣K

West starts with ♣AK and switches to ♥Q. Plan the play.