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Remember, the defenders don't know that declarer is about to pitch a club from dummy on the other high diamond when the first club is played from dummy (although they may certainly suspect it).
I think both defenders do know a pitch is coming in this hand. The opening leader has led from the Q and seen it go J, A. Partner of the opening leader can be pretty sure the lead is not from KQ!
The ♣K is probably not the correct card from declarer, the Q feels better would you duck from Ax if declarer's club suit might be QJxx?
The defender with ♣A is not likely to play declarer for KJTx since he has a reasonable line for his contract by finessing the J. His other consideration is that is there a possibilty that declarer has gambled in the bidding maybe he has x AQJxx AKx KQJx. Why should he in any case play declarer for a normal 2♣ opener?

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