Look at this:
You will make at least 2 tricks: at worst, you will give up the King.
If you want to try to do better, you can consider a finesse. And making a finesse is playing towards honors that are not masters, so you should play towards QJ10.
But in this case, all the opponent has to do is play their King (wherever it is) to limit you to 2 tricks, so you would gain nothing.
Now, since you have everything except the King, try something else: play the Queen and if West plays small, call a small card from dummy.
If the King is in East, they will make it, obviously, and you couldn't do anything about it.
But here's what will happen if the King is in West:
You will win the trick and you will continue by playing the Jack, with the idea of playing a small card from dummy if West chooses to play small again.
But imagine this time that they play the King:
You take with the Ace and your ♣10 is established: you will therefore make all 3 tricks. That's better.
What you did here is quite different from a finesse, even though it also works once out of 2. You established your lower honors by taking the opponent's honor 'in a pincer' between these lower honors and the dummy's higher honor (the Ace).
This maneuver is called a 'forcing finesse'. It is very different from a classic finesse in that you don't play towards the honor that is not master, as usual, but you lead from the honor that is not master.
The forcing finesse leads to 'consuming' 2 honors from your side to take 1 from the opponent (all they have to do is provide their honor). Needless to say, you need to have the means!
North holds A83 and South QJ10 in Clubs. South plays the Queen; West provides the King. What do you play from North?
Section quizOnly one suit at No Trump; useful communications are available. Other suits are not evaluated.
And here's a variant, where you will take with a forcing finesse... an Ace!
This is only possible with a card higher than the Ace, as you understood.
Yes, it is possible, look! You play with trump Hearts:
Clubs have never been played so far.
You play the King and West follows with a small Club.
Discard a small Diamond!
If the Ace was in East, they would win the trick but you couldn't do anything about it.
However, if the Ace is in West...
...you win the trick with the King, and you continue by playing the Queen.
So imagine that this time, West plays the Ace.
You ruff and Jack - 10 are established.
You have established your lower honors by taking the opponent's honor again with a forcing finesse between these honors and, this time, a trump.
With Spades as trump, South holds KQJ in Diamonds. The dummy has no Diamonds and has the Ace of Spades. South plays the King and West provides the Ace. Which card do you play from dummy?
Section quizNorth holds A74. In which South hand can leading with the Queen usefully force West's King: Q93 or QJ10?
Section quizCome on, it's your turn to make forcing finesses... but only when you have the means!