What causes a clicking sound when front left wheel turns?

Could be a hub cap, in which case removing and driving will answer that. Better chance of a half shaft on it's way out. A half shaft runs between the transaxle and the wheel. On each end there is a constant velocity joint. The joints are each covered with a black bellow shaped boot to protect the joint. Stick your snoot under the side that is making the noise and inspect the two boots. If you see grease flung out from the centrifical force, look closley at the boot(s) for a crack or tear in it. IF so, replace the halfshaft. While you can relace just the joint and boot, it is more costly, more of a pain in the butt and you still will only have one new joint.