Squadrone, do you notice the clutch pedal is suddenly hanging a little bit lower than the brake pedal?
If so there is a common alfa problem: the clutch pivot is a known weakpoint, the weld suddenly gives up the ghost and when you depress the clutch, the pivot weld bends (so to speak).
If it is hanging lower, can you pull it up so that it is level with the brake? If so that is a sure sign.
If you can confirm this, there are loads of links to replace this, including a remanufatured much stronger pivot, you can get from the States.
If this is not the case, then perhaps the clutch flexible pipe near the slave cylinder is contaminated and "expands" when you depress the clutch (which affects the clutch, and makes it feel as though you are only pushing it half way down......hence the crunch!)
Failing that then a clutch fluid bleed, but if you haven't worked on the clutch, then I don't see why it suddenly has air in it.
This is the pivot (moving in the video!)
Clutch Pivot Arm 1988 Spider - YouTube