The Squeeze-Trim-Endplay: Hand
This hand was played by Alfred Kudlek and reported by Don Kersey, in his 1990 Bridge World article analyzing this type of play (which he called a one-threat squeeze).
Lefty opened 1, Righty bid 1, and you overcalled 2. Lefty supported partner with 2, your partner supported you with 3, and Righty doubled to end the auction. The opening lead was a trump.
Kudlek now led a spade, and the defenders cashed three spade tricks, Righty showing the KQJ and Lefty Axx. Finally, a heart was led to the ace.
At the point, the club honors can be placed. Lefty has one of the heart honors, the spade ace, and hence the AQ of clubs for his opening bid. You continue with diamonds, Righty having four. Lefty started with 3 spades, 5 hearts, 1 diamond, and hence 3 clubs. After drawing four rounds of trumps, this is the situation:
You can take the club finesse once, but how do you get back to your hand? Yes, you can ruff a heart, but then maybe Lefty can win the ace of clubs and cash a heart.
All you have to do is cash your 10 of spades, to squeeze Lefty, then read the distribution. Lefty will be reduced to 4 cards. If three of them are clubs, only one is a heart. You can take the club finesse, and your heart ruff to your hand takes care of Lefty's last heart. If Lefty saves two hearts, Lefty can save only two clubs. In that case, you can lead once towards dummy, and when that wins, lead a second club from dummy to set up the other honor in clubs.