Rear Right Click when accelerating - CV joint?

[CLS70]

The X5 (e70 3.0si) has developed a loud click that appears to come from the rear right side/wheel; I can hear it clearly and is speed dependent --1 click per wheel turn-- it does not change if turning or going in a straight line, however, it only sounds when accelerating; e.g. if I let go the accelerator and allow the car to coast, the click goes away completely; as soon as I press the accelerator again, the click returns.

It is very noticeable between 10 to 40 km/h, after that seems to fade away --it could be that by then the wheel is turning faster so clicks are closer--

I'm suspecting a CV join but would appreciate other items to look for; by the way, I few weeks ago I got the Parking Brake malfunction and was in the process of sourcing parts; not sure if this will be related or maybe the same issue.

Thanks.