Preventing the danger hand getting the lead

10 9 8 7
7 5
6 4 2
K Q J 10
N
W E
S
A Q J 5 4 3
A 6
K 7
A 4 3
Vuln None
Dealer South
West North East South
1
Pass 2 Pass 4
All Pass
4
by S
Lead: Q

We have resources for ten tricks even if the trump finesse fails. The problem is that we may lose a trump, a heart and two diamonds before we can discard a diamond on dummy's fourth club. We will be okay as long as East doesn't get the lead, because west cannot attack our diamonds. Plan the play to ensure the contract.