The present invention relates to a lithographic projection apparatus with a supporting structure to support and move an object, like a substrate. The supporting structure may be a robot having a robotic arm with a support frame for supporting, e.g. the substrate. The support frame includes a clamping structure having one or more clamps for holding the substrate during movement. The robot arm comprises one or more compliant parts. The clamp may be a Johnson-Raybeck effect type clamp with an oxidized upper surface. For better de-clamping, a RF AC decaying de-clamping voltage may be provided to the clamp. The apparatus may be cleaned with one single substrate only.