This deal is from the English Championships about 45 years ago. The bidding went (North dealer):
1♦ - 1♠
2♥ - 2NT
3NT - pass
North overbid a couple of times, but that is not a concern of yours. You lead ♣2 to partner's ace and declarer's 5. East continues with ♣7 to your jack over South's 8. At this point the player in the West seat erred and let the contract through.
Can you do better? What do you lead at trick 3 and why? Again hidden text would be nice, but it's not a must.
Roland

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South: 3NT
Lead: C2