Most likely a bad CV joint. Clunking on both acceleration and when you lift off the throttle is a good clue as is increased noise with maximum steering lock.
Good CV joints have essentially zero play. Bad ones, unless they're REALLY bad, also have very little play, so it can be tricky to diagnose a bad one by wiggling the parts back and forth. However, it's worth a look. If you can detect any play, it's most likely bad. Also look for a split boot (and dry joint), which is a good clue that you have a bad CV joint. I would not recommend driving until the part fails completely; change it as soon as you can identify a CV joint as the real problem.
I've changed many of them, but not on an Alfa. Typically it's not too difficult to fit replacement drive shafts. Normally you buy a new or reconditioned drive shaft complete with the CV joints on each end because often times removing the CV joint from the shaft requires more capability than the normal home mechanic has; a press for example.
Some units require a set of special pliers to remove a Snap Ring, Circlip, E-Clip, Retaining Ring, or whatever you call these kind of retaining clips where you live. You'll also need the correct kind of hex key or Torx wrench or whatever kind of bolts are used to mount the CV joints on your particular car. You also may need a big socket and a long handle to remove a large nut from the stub axle.
Again, I have not done this job on your kind of Alfa. If it is NOT a diy job, perhaps someone will chime in here and tell me I've given you bad advice.