Short answer: no.
Long answer: Yes, but you need to use multi-pass rendering. First, hide the entity you want in wireframe, and call RenderWorld(). Then hide everything you just rendered, Show the entity you want in wireframe, use CameraClsMode Cam,False,False (since you don't want to clear the color buffer OR the zbuffer), then RenderWorld() again. Finally, call CameraClsMode Cam,True,True. Flip, job done.
Long answer: Yes, but you need to use multi-pass rendering. First, hide the entity you want in wireframe, and call RenderWorld(). Then hide everything you just rendered, Show the entity you want in wireframe, use CameraClsMode Cam,False,False (since you don't want to clear the color buffer OR the zbuffer), then RenderWorld() again. Finally, call CameraClsMode Cam,True,True. Flip, job done.