The term clicker comes from the click made when the primary extraction cam breaks a tight case loose from the chamber.
If you are getting a click, that means you have primary extraction and at that point the case is free in the chamber and the bolt would come back easy. My bet is your primary extraction is lacking and you are having to do the job by pulling the bolt back, and it will be stiff. Primary extraction and clickers occur at the top of up stroke. Clicker = very tight case diameter after firing, and is not usually a pressure sign. It has nothing to do with length, that would be a stiff bolt from the very bottom of the lift and is usually a pressure sign.
To understand clickers you need to understand what is happening in the chamber. When you fire a case it expands to fit the chamber, the barrel steel also expands slightly. Both the steel and brass will spring back after the pressure drops. Brass has a much lower yield point than steel so it will yield some when the chamber steel is expanded under pressure. Now your barrel steel springs back to normal size and your brass does not since it has yielded and now you have an interference fit (tight case). This is most common just above the base of the extractor groove because that is thicker brass and many dies do not do a good job of sizing that area. The reason that sizing that area is important is because the brass will still spring back some amount after the pressure drops. If the fit in the chamber is already tight, it will not spring back enough to eject freely. The very simple way to never experience this issue is to make sure the die is sizing correctly.
