i've had a problem like that with my old car. Whenever i turned left i heard clicking sound and it did turn out to be the cv boot ripped and the lubricatoin grease leaked out. I believe it was about 250 parts and labor to get fixed. If u caught the problem early u could have been able to get away with replacing the just the boot. Dirt will get inside the boot and eventually contaminate the joint and it'll wear out and break. If the lubrication is gritty it's contaminated and they have to dissasemble the joint to get the dirt out or replace it if it needs to be. But the longer u drive it the more crap u'll get in it..
I get it fixed as soon as i can if i were you. Good luck!