Engine or gearbox mount perhaps mate?
or possibly the handbrake sticking on? mine does it,only when handbrake has been on for a good few hours
Possibly cv joint... Mine 'clunked' when moving off, and it was a split in the sleeve... New sleeve, with fresh grease, and all was good!
If its when you pull off quickly chances are its upper engine mount.
I had it with mine and a new upper engine mount sorted mine, does the engine move much if you grab it by the inlet tubes and rock it back and forwards?